Spoilers for recently-released games ahead, in case you're new.
Introduction
Having lately bowed to pressure and started paying for a Premium Plan on Pokemon Home, I recently gathered every mythical in the series into one glorious group.
For more than a decade, mythical Pokemon were entirely exclusive to events and could not be obtained in normal gameplay. It wasn't until the release of My Pokemon Ranch that Mew became available on a repeatable, non time-restricted basis. Gradually, others started to be made available without events as well. This has obviously made many mythical Pokemon far easier to obtain than they once were. But some mythicals still remain exclusive to time- or location-locked events, and it's made me curious as to which one is the rarest, or least accessible, of the group.
So I did a little research, and decided to enumerate my findings in case anyone else was curious.
Premise
I decided to look at each mythical and count how many times they have been distributed, and for how long. Primarily, I will be counting the period of days a Pokemon has been made available in total. For equivalent distributions in different countries, they will count as the same distribution unless the dates are different: i.e. if a Pokemon was available from January 1st until March 31st 2022 in PAL regions but from January 15th to March 20th 2022 in Japan, the longer date is counted. Other factors to consider in the case of a tie or an unclear result will be the number of generations relative to the potential maximum it was made available in. For example, if a Pokemon from Gen V was only ever distributed in Gen V and VI, this would make it rarer than one which was distributed in Gen V, VI, VII, and VIII.
No Pokemon game in Gen VIII or IX has the capacity to contain all the mythicals, so I am treating Pokemon Home as the "base" title: the premise assumes that I will be putting any mythical into Home.
Exemptions
So, before we look at periods of availability, we can eliminate any mythical which can be obtained in a main series title via standard gameplay.
Note that for the purpose of this list, "main series" here is taken to mean any title compatible with the main series, including Pokemon Go and spinoffs like Ranch and Colosseum. "Standard gameplay" here is taken to mean:
-for free
For the purposes of this post, the purchase cost of a game, app, or DLC will not be taken into account. "For free" refers to the specific Pokemon itself - if the base game costs $XX but obtaining the mythical costs a further $YY, then it is considered to cost $YY. This distinction is relevant when considering, say, the availability of Mew within LGPE, as this is only possible via the purchase of a peripheral device.
-without a time-locked or ticketed event
-without external influence
...therefore, Pokemon which require save data bonuses (such as Jirachi in BDSP or Shaymin in L:A) are not considered part of standard gameplay, because players need a separate game to obtain them and they are not free. To wit, Deoxys in ORAS may be obtained all the time, by every player; Jirachi in BDSP may not. Below are all the mythical Pokemon obtainable who fit this criteria.
With those examples out of the way, let's move on to the Pokemon not freely available.
So, since this thread started... we now only have one mythical Pokemon left which has not been made available without restriction in some form. Thus the conclusion has become pretty much a given! Seeing as that's a bit undramatic, I thought I'd throw together a few other stats in case anything of interest jumped out at me.
TL;DR
There isn't one, this is the whole post. Thanks for reading.
Updated as of December 2025
Introduction
Having lately bowed to pressure and started paying for a Premium Plan on Pokemon Home, I recently gathered every mythical in the series into one glorious group.
For more than a decade, mythical Pokemon were entirely exclusive to events and could not be obtained in normal gameplay. It wasn't until the release of My Pokemon Ranch that Mew became available on a repeatable, non time-restricted basis. Gradually, others started to be made available without events as well. This has obviously made many mythical Pokemon far easier to obtain than they once were. But some mythicals still remain exclusive to time- or location-locked events, and it's made me curious as to which one is the rarest, or least accessible, of the group.
So I did a little research, and decided to enumerate my findings in case anyone else was curious.
Premise
I decided to look at each mythical and count how many times they have been distributed, and for how long. Primarily, I will be counting the period of days a Pokemon has been made available in total. For equivalent distributions in different countries, they will count as the same distribution unless the dates are different: i.e. if a Pokemon was available from January 1st until March 31st 2022 in PAL regions but from January 15th to March 20th 2022 in Japan, the longer date is counted. Other factors to consider in the case of a tie or an unclear result will be the number of generations relative to the potential maximum it was made available in. For example, if a Pokemon from Gen V was only ever distributed in Gen V and VI, this would make it rarer than one which was distributed in Gen V, VI, VII, and VIII.
No Pokemon game in Gen VIII or IX has the capacity to contain all the mythicals, so I am treating Pokemon Home as the "base" title: the premise assumes that I will be putting any mythical into Home.
Exemptions
So, before we look at periods of availability, we can eliminate any mythical which can be obtained in a main series title via standard gameplay.
Note that for the purpose of this list, "main series" here is taken to mean any title compatible with the main series, including Pokemon Go and spinoffs like Ranch and Colosseum. "Standard gameplay" here is taken to mean:
-for free
For the purposes of this post, the purchase cost of a game, app, or DLC will not be taken into account. "For free" refers to the specific Pokemon itself - if the base game costs $XX but obtaining the mythical costs a further $YY, then it is considered to cost $YY. This distinction is relevant when considering, say, the availability of Mew within LGPE, as this is only possible via the purchase of a peripheral device.
-without a time-locked or ticketed event
-without external influence
...therefore, Pokemon which require save data bonuses (such as Jirachi in BDSP or Shaymin in L:A) are not considered part of standard gameplay, because players need a separate game to obtain them and they are not free. To wit, Deoxys in ORAS may be obtained all the time, by every player; Jirachi in BDSP may not. Below are all the mythical Pokemon obtainable who fit this criteria.
Mew
Mew is available from My Pokemon Ranch if the player deposits 999 Pokemon. However, this does require at least one copy of Diamond or Pearl (or Platinum in Japan).
It is moot now as Ranch can no longer be legitimately downloaded, and since Mew is available from Pokemon Go via the "A Mythical Discovery" questline.
Mew is currently indefinitely available in Pokemon Go and (partially) My Pokemon Ranch
Celebi
Celebi is available in the Virtual Console release of Crystal (edit: as of 2023, no longer available) and also from Pokemon Go via the "A Ripple In Time" questline.
Celebi is currently indefinitely available in Pokemon Go and (with caveats) Pokemon Crystal's Virtual Console edition
Jirachi
Jirachi is available from Pokemon Go via the "A Thousand-Year Slumber" questline.
edit: Something I originally forgot to take into account when writing this post is that Jirachi can be obtained in Pokemon Channel through regular gameplay (as opposed its availability in Colosseum, which required a bonus disc) and then transferred to Pokemon Ruby or Sapphire. This would make it freely available in Gen III, especially when factoring in that it can be repeatedly obtained with different save files. Considering Pokemon Channel a main series game is quite the stretch even despite its ability to connect to the GBA titles; however, it would fit the criteria of being available without restriction so by this thread's metrics it counts.
Jirachi is currently indefinitely available in Pokemon Go and in Pokemon Channel
Deoxys
Deoxys is encountered in Omega Ruby and Alpha Sapphire as part of the storyline, making it the first mythical to be capturable in-game without the need for an event item.
Deoxys is currently indefinitely available in Pokemon Omega Ruby and Alpha Sapphire
Phione
Phione is encountered in Legends: Arceus as part of the storyline. It is, of course, also infinitely available in games where breeding is possible if the player already has a Manaphy or a Phione.
Phione is currently indefinitely available in Pokemon Legends: Arceus
Manaphy
Manaphy is encountered in Legends: Arceus as part of the storyline. It is also available in Pokemon Home as a reward for completing the BDSP Sinnoh dex with Pokemon native to those titles.
Manaphy is currently indefinitely available in Pokemon Legends: Arceus, and is indefinitely available in Pokemon Home
Shaymin
Shaymin is available from Pokemon Go via the "Grass and Gratitude" questline.
Shaymin is currently indefinitely available in Pokemon Go
Darkrai
Darkrai is obtainable in the Mega Dimensions DLC.
Darkrai is currently indefinitely available in the Mega Dimensions DLC
Arceus
Arceus is encountered in Legends: Arceus as part of the storyline.
Arceus is currently indefinitely available in Pokemon Legends: Arceus
Victini
Victini is available in Pokemon Go via the "Investigate A Mysterious Energy" questline.
Victini is currently indefinitely available in Pokemon Go
Keldeo
Keldeo is available in the Crown Tundra DLC and in the Mega Dimensions DLC. It is also available in Pokemon Home as a reward for completing the Galar, Isle of Armour, and Crown Tundra Pokedexes with Pokemon native to those titles. It has been announced that it will be freely available in Pokemon Go via a new special research questline, but at the time of writing this has not been made available.
Keldeo is currently indefinitely available in the Crown Tundra DLC and in the Mega Dimensions DLC. It is also indefinitely available in Pokemon Home, and is planned to be indefinitely available in Pokemon Go.
Meloetta
Meloetta is available in the Indigo Disk DLC and in the Mega Dimensions DLC. It is also available in Pokemon Home as a reward for completing the Paldea, Kitakami, and Blueberry Pokedexes with Pokemon native to those titles. It is also available from Pokemon Go via the "Finding Your Voice" questline.
Meloetta is currently indefinitely available in the Indigo Disk DLC and in the Mega Dimensions DLC. It is also indefinitely available in Pokemon Home and in Pokemon Go.
Genesect
Genesect is available in the Mega Dimensions DLC.
Meloetta is currently indefinitely available in the Mega Dimensions DLC.
Diancie
Diancie is available in the Mega Dimensions DLC. It is also available in Pokemon Go via the "Glitz and Glam" questline.
Diancie is currently indefinitely available in the Mega Dimensions DLC, and is also indefinitely available in Pokemon Go.
Hoopa
Hoopa is available in the Mega Dimensions DLC.
Hoopa is currently indefinitely available in the Mega Dimensions DLC
Volcanion
Volcanion is available in the Mega Dimensions DLC. At the time of writing, it is not currently available in Pokemon Go; however, following precedent it is highly likely that it will be released via a new special research questline at some point in the near future.
Volcanion is currently indefinitely available in the Mega Dimensions DLC
Magearna
Magearna is available in Sun, Moon, Ultra Sun, and Ultra Moon via scanning a QR code. This makes it the first mythical to be available via an in-game event before any external event distributions. It is also available in the Mega Dimensions DLC.
The Original Colour Magearna is also technically freely available in Pokemon Home. Six Pokemon are available to the player as Mystery Gifts in Pokemon Home without needing to connect to any other software, meaning that players can technically repeatedly trade to fill the Pokedex without relying on other games. However, in practice this would be extremely difficult and time-consuming. This makes Original Colour Magearna significantly harder to obtain than any of the other "free" mythicals.
Magearna is currently indefinitely available in Pokemon Sun, Moon, Ultra Sun, Ultra Moon, and in the Mega Dimensions DLC. It is also indefinitely available in Pokemon Home
Marshadow
Marshadow is available in the Mega Dimensions DLC. It is also available in Pokemon Go via the "A Striking Shadow" questline.
Marshadow is currently indefinitely available in the Mega Dimensions DLC, and is also indefinitely available in Pokemon Go.
Zeraora
Zeraora is available in the Mega Dimensions DLC.
Zeraora is currently indefinitely available in the Mega Dimensions DLC
Meltan and Melmetal
Meltan and Melmetal are available in Pokemon Go via the "Let's GO, Meltan!" questline and infinitely through utilising the Mystery Box. Pokemon Home gives the player a Melmetal as a Mystery Gift after transferring any species from Pokemon Go, and a Meltan is also available in Pokemon Home as a reward for completing the LGPE Kanto dex with Pokemon native to those titles. Both species are also separately obtainable in the Mega Dimensions DLC.
Meltan and Melmetal are currently indefinitely available in the Mega Dimensions DLC, in Pokemon Go, and in Pokemon Home
Pecharunt
Pecharunt is obtainable in the Indigo Disk DLC.
Pecharunt is currently indefinitely available in the Indigo Disk DLC
Mew is available from My Pokemon Ranch if the player deposits 999 Pokemon. However, this does require at least one copy of Diamond or Pearl (or Platinum in Japan).
It is moot now as Ranch can no longer be legitimately downloaded, and since Mew is available from Pokemon Go via the "A Mythical Discovery" questline.
Mew is currently indefinitely available in Pokemon Go and (partially) My Pokemon Ranch
Celebi
Celebi is available in the Virtual Console release of Crystal (edit: as of 2023, no longer available) and also from Pokemon Go via the "A Ripple In Time" questline.
Celebi is currently indefinitely available in Pokemon Go and (with caveats) Pokemon Crystal's Virtual Console edition
Jirachi
Jirachi is available from Pokemon Go via the "A Thousand-Year Slumber" questline.
edit: Something I originally forgot to take into account when writing this post is that Jirachi can be obtained in Pokemon Channel through regular gameplay (as opposed its availability in Colosseum, which required a bonus disc) and then transferred to Pokemon Ruby or Sapphire. This would make it freely available in Gen III, especially when factoring in that it can be repeatedly obtained with different save files. Considering Pokemon Channel a main series game is quite the stretch even despite its ability to connect to the GBA titles; however, it would fit the criteria of being available without restriction so by this thread's metrics it counts.
Jirachi is currently indefinitely available in Pokemon Go and in Pokemon Channel
Deoxys
Deoxys is encountered in Omega Ruby and Alpha Sapphire as part of the storyline, making it the first mythical to be capturable in-game without the need for an event item.
Deoxys is currently indefinitely available in Pokemon Omega Ruby and Alpha Sapphire
Phione
Phione is encountered in Legends: Arceus as part of the storyline. It is, of course, also infinitely available in games where breeding is possible if the player already has a Manaphy or a Phione.
Phione is currently indefinitely available in Pokemon Legends: Arceus
Manaphy
Manaphy is encountered in Legends: Arceus as part of the storyline. It is also available in Pokemon Home as a reward for completing the BDSP Sinnoh dex with Pokemon native to those titles.
Manaphy is currently indefinitely available in Pokemon Legends: Arceus, and is indefinitely available in Pokemon Home
Shaymin
Shaymin is available from Pokemon Go via the "Grass and Gratitude" questline.
Shaymin is currently indefinitely available in Pokemon Go
Darkrai
Darkrai is obtainable in the Mega Dimensions DLC.
Darkrai is currently indefinitely available in the Mega Dimensions DLC
Arceus
Arceus is encountered in Legends: Arceus as part of the storyline.
Arceus is currently indefinitely available in Pokemon Legends: Arceus
Victini
Victini is available in Pokemon Go via the "Investigate A Mysterious Energy" questline.
Victini is currently indefinitely available in Pokemon Go
Keldeo
Keldeo is available in the Crown Tundra DLC and in the Mega Dimensions DLC. It is also available in Pokemon Home as a reward for completing the Galar, Isle of Armour, and Crown Tundra Pokedexes with Pokemon native to those titles. It has been announced that it will be freely available in Pokemon Go via a new special research questline, but at the time of writing this has not been made available.
Keldeo is currently indefinitely available in the Crown Tundra DLC and in the Mega Dimensions DLC. It is also indefinitely available in Pokemon Home, and is planned to be indefinitely available in Pokemon Go.
Meloetta
Meloetta is available in the Indigo Disk DLC and in the Mega Dimensions DLC. It is also available in Pokemon Home as a reward for completing the Paldea, Kitakami, and Blueberry Pokedexes with Pokemon native to those titles. It is also available from Pokemon Go via the "Finding Your Voice" questline.
Meloetta is currently indefinitely available in the Indigo Disk DLC and in the Mega Dimensions DLC. It is also indefinitely available in Pokemon Home and in Pokemon Go.
Genesect
Genesect is available in the Mega Dimensions DLC.
Meloetta is currently indefinitely available in the Mega Dimensions DLC.
Diancie
Diancie is available in the Mega Dimensions DLC. It is also available in Pokemon Go via the "Glitz and Glam" questline.
Diancie is currently indefinitely available in the Mega Dimensions DLC, and is also indefinitely available in Pokemon Go.
Hoopa
Hoopa is available in the Mega Dimensions DLC.
Hoopa is currently indefinitely available in the Mega Dimensions DLC
Volcanion
Volcanion is available in the Mega Dimensions DLC. At the time of writing, it is not currently available in Pokemon Go; however, following precedent it is highly likely that it will be released via a new special research questline at some point in the near future.
Volcanion is currently indefinitely available in the Mega Dimensions DLC
Magearna
Magearna is available in Sun, Moon, Ultra Sun, and Ultra Moon via scanning a QR code. This makes it the first mythical to be available via an in-game event before any external event distributions. It is also available in the Mega Dimensions DLC.
The Original Colour Magearna is also technically freely available in Pokemon Home. Six Pokemon are available to the player as Mystery Gifts in Pokemon Home without needing to connect to any other software, meaning that players can technically repeatedly trade to fill the Pokedex without relying on other games. However, in practice this would be extremely difficult and time-consuming. This makes Original Colour Magearna significantly harder to obtain than any of the other "free" mythicals.
Magearna is currently indefinitely available in Pokemon Sun, Moon, Ultra Sun, Ultra Moon, and in the Mega Dimensions DLC. It is also indefinitely available in Pokemon Home
Marshadow
Marshadow is available in the Mega Dimensions DLC. It is also available in Pokemon Go via the "A Striking Shadow" questline.
Marshadow is currently indefinitely available in the Mega Dimensions DLC, and is also indefinitely available in Pokemon Go.
Zeraora
Zeraora is available in the Mega Dimensions DLC.
Zeraora is currently indefinitely available in the Mega Dimensions DLC
Meltan and Melmetal
Meltan and Melmetal are available in Pokemon Go via the "Let's GO, Meltan!" questline and infinitely through utilising the Mystery Box. Pokemon Home gives the player a Melmetal as a Mystery Gift after transferring any species from Pokemon Go, and a Meltan is also available in Pokemon Home as a reward for completing the LGPE Kanto dex with Pokemon native to those titles. Both species are also separately obtainable in the Mega Dimensions DLC.
Meltan and Melmetal are currently indefinitely available in the Mega Dimensions DLC, in Pokemon Go, and in Pokemon Home
Pecharunt
Pecharunt is obtainable in the Indigo Disk DLC.
Pecharunt is currently indefinitely available in the Indigo Disk DLC
With those examples out of the way, let's move on to the Pokemon not freely available.
Zarude
Zarude was, at one point, available in Pokemon Go via the "Search for Zarude!" questline, which was timelocked and is currently no longer available. It has not been obtainable in any form since then.
Zarude has had six distinct distributions in Gen VIII and two in Gen IX, and has been available for 535 days in total. Though I listed Zarude above, I am including it here too because as the most recent mythical Pokemon, I had initially intended to omit it from the listing as it seemed likely that its numbers would have been far lower than the rest, making it an outlier. However, after seeing that Zarude's number is higher than Diancie's, I decided to include it.
EDIT: The Dada form of Zarude has so far been available for 338 days in total, and has not been distributed in Gen IX. As BlizzardHero notes below, the circumstances of the pandemic made obtaining it potentially more difficult than previous legendary and mythical distributions, meaning that its wide availability does not necessarily indicate the full story.
Original form Zarude was last available on May 31st, 2025 from an event distribution, while Dada Zarude was last available on December 31, 2021 from an event distribution
Zarude was, at one point, available in Pokemon Go via the "Search for Zarude!" questline, which was timelocked and is currently no longer available. It has not been obtainable in any form since then.
Zarude has had six distinct distributions in Gen VIII and two in Gen IX, and has been available for 535 days in total. Though I listed Zarude above, I am including it here too because as the most recent mythical Pokemon, I had initially intended to omit it from the listing as it seemed likely that its numbers would have been far lower than the rest, making it an outlier. However, after seeing that Zarude's number is higher than Diancie's, I decided to include it.
EDIT: The Dada form of Zarude has so far been available for 338 days in total, and has not been distributed in Gen IX. As BlizzardHero notes below, the circumstances of the pandemic made obtaining it potentially more difficult than previous legendary and mythical distributions, meaning that its wide availability does not necessarily indicate the full story.
Original form Zarude was last available on May 31st, 2025 from an event distribution, while Dada Zarude was last available on December 31, 2021 from an event distribution
So, since this thread started... we now only have one mythical Pokemon left which has not been made available without restriction in some form. Thus the conclusion has become pretty much a given! Seeing as that's a bit undramatic, I thought I'd throw together a few other stats in case anything of interest jumped out at me.
Longest event-exclusive mythical
After a staggering 22 years of being exclusive to events and raids, Darkrai became ordinarily obtainable in 2025 with the release of the Legends: Z-A Mega Dimensions DLC. Manaphy just narrowly beats out Shaymin for second place, as Manaphy was event-exclusive from its first distribution in December 2006 until the release of Legends: Arceus in 2022; Shaymin was first released as an event distribution in July 2008 (with the Oak's Letter item not being made available until 2009) and subsequently being released for free in Pokemon Go in 2023.
Longest shiny-locked mythical
Despite all its fellow Gen V mythicals having had their shiny forms made available, and numerous mythicals from later generations getting their turn before it, Victini has been shiny-locked for over fifteen years since it was first made available in September 2010. Hoopa follows it in second place, having first been made available in July 2015; Volcanion, first released in April 2016, is third. Magearna, Marshadow, Zarude, and Pecharunt are the only other remaining shiny-locked mythical Pokemon.
Shortest shiny-locked mythical
Not counting those available at base release (Mew, Celebi, Jirachi, and Deoxys), Genesect took the shortest amount of time for its shiny form to become available, first being distributed in non-shiny form in August 2012 and then again in shiny form in June 2013: less than a full year later. Diancie followed a similar release pattern, first being distributed in non-shiny form in 2014 before its shiny was distributed in 2015 (though with a gap of 18 months compared to Genesect's 11). However, both of these Pokemon are eclipsed by Meltan, which debuted in Pokemon Go in November 2018 and had its shiny released a mere four months later in February 2019.
Widest availability
Due to being encounterable in two games as well as Pokemon Home and Go, Meloetta and Keldeo are neck-and-neck for the top spot of most easily-attainable mythical. Note that "widest-available" in this context refers to the freely-available methods outlined herein, rather than referring to number and/or method of distributions: were that to be the case, Mew would almost certainly take the top spot purely due to its position as the oldest mythical. Of the two, Meloetta edges its way to the top spot due to being available for longer - it has been freely available in Go since September 2021, and in the Indigo Disk since December 2023, vs Keldeo's availability in the Crown Tundra since October 2020 and being still-to-come in Go. After them come Meltan, Melmetal, and Magearna, who all have various methods of obtainability across several different titles.
Most readily available shiny form
Not much in this one. Of all the mythicals whose shiny forms are obtainable, both Meltan and Manaphy are available for the lowest effort, requiring only 150 Pokemon to be registered in their respective games vs 584 and 659 for Keldeo and Meloetta respectively. Discounting event distributions of shiny mythicals, Mew, Celebi, Jirachi, Shaymin, and Keldeo's (as well as Diancie's currently-unreleased) masterwork researches in Pokemon Go would count as events due to being time-restricted and each require significant effort and time investment. Shiny Meltan is catchable in Pokemon Go at a boosted rate, albeit only during specific event periods; however, this added availability pushes it slightly ahead of Manaphy, which is otherwise extremely difficult to obtain in shiny form.
After a staggering 22 years of being exclusive to events and raids, Darkrai became ordinarily obtainable in 2025 with the release of the Legends: Z-A Mega Dimensions DLC. Manaphy just narrowly beats out Shaymin for second place, as Manaphy was event-exclusive from its first distribution in December 2006 until the release of Legends: Arceus in 2022; Shaymin was first released as an event distribution in July 2008 (with the Oak's Letter item not being made available until 2009) and subsequently being released for free in Pokemon Go in 2023.
Longest shiny-locked mythical
Despite all its fellow Gen V mythicals having had their shiny forms made available, and numerous mythicals from later generations getting their turn before it, Victini has been shiny-locked for over fifteen years since it was first made available in September 2010. Hoopa follows it in second place, having first been made available in July 2015; Volcanion, first released in April 2016, is third. Magearna, Marshadow, Zarude, and Pecharunt are the only other remaining shiny-locked mythical Pokemon.
Shortest shiny-locked mythical
Not counting those available at base release (Mew, Celebi, Jirachi, and Deoxys), Genesect took the shortest amount of time for its shiny form to become available, first being distributed in non-shiny form in August 2012 and then again in shiny form in June 2013: less than a full year later. Diancie followed a similar release pattern, first being distributed in non-shiny form in 2014 before its shiny was distributed in 2015 (though with a gap of 18 months compared to Genesect's 11). However, both of these Pokemon are eclipsed by Meltan, which debuted in Pokemon Go in November 2018 and had its shiny released a mere four months later in February 2019.
Widest availability
Due to being encounterable in two games as well as Pokemon Home and Go, Meloetta and Keldeo are neck-and-neck for the top spot of most easily-attainable mythical. Note that "widest-available" in this context refers to the freely-available methods outlined herein, rather than referring to number and/or method of distributions: were that to be the case, Mew would almost certainly take the top spot purely due to its position as the oldest mythical. Of the two, Meloetta edges its way to the top spot due to being available for longer - it has been freely available in Go since September 2021, and in the Indigo Disk since December 2023, vs Keldeo's availability in the Crown Tundra since October 2020 and being still-to-come in Go. After them come Meltan, Melmetal, and Magearna, who all have various methods of obtainability across several different titles.
Most readily available shiny form
Not much in this one. Of all the mythicals whose shiny forms are obtainable, both Meltan and Manaphy are available for the lowest effort, requiring only 150 Pokemon to be registered in their respective games vs 584 and 659 for Keldeo and Meloetta respectively. Discounting event distributions of shiny mythicals, Mew, Celebi, Jirachi, Shaymin, and Keldeo's (as well as Diancie's currently-unreleased) masterwork researches in Pokemon Go would count as events due to being time-restricted and each require significant effort and time investment. Shiny Meltan is catchable in Pokemon Go at a boosted rate, albeit only during specific event periods; however, this added availability pushes it slightly ahead of Manaphy, which is otherwise extremely difficult to obtain in shiny form.
TL;DR
There isn't one, this is the whole post. Thanks for reading.
Updated as of December 2025
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