Well pyuk has pretty much summed it all up on point, so I may as well elaborate where I can out in the open.
As Pecharunt has fallen from the format, its rival Ogerpon rises in fitting fashion, so I may as well take this opportunity to write up an updated reference for Weird Ogerpon Mechanics that are surprisingly relevant, since my original 2023 first impression coverage would now be outdated in a couple notable aspects.
Ogerpon tera formes terastallizing and having no stats is one half of the key behind that replay, and is not a thing anymore as of the changes made in https://github.com/smogon/pokemon-showdown/pull/10814. Now Ogerpon's tera formes can properly terastallize themselves, so as far as I know there shouldn't be any gameplay difference between picking a base masked forme versus the corresponding Tera forme to start. Or aesthetic difference as of now, since the PS models have no difference, other than how long your name is before you tera.
Only the form you pick in the teambuilder matters for most of Ogerpon's gameplay aspects, and for demonstration, you could try to represent all four elements in one Ogerpon set through forme/item/ability/tera type even if it's completely inefficient:
In practice, this Ogerpon will just be a Grass/Rock type with no mask or stat boost, that will be able to go Tera Fire and get a Defense boost from Embody Aspect afterwards.
Ogerpon needs to hold the actual mask corresponding to its forme for the 20% power boost, and the Embody Aspect abilities can't trigger at the start of battle because the user has to be terastallized, so you can't double up on stat boosts like this.
I don't have much to add about the masks, but I did find in testing that there are some cases when the power boosts of these items may not actually affect damage compared to not having them. That is, when the 60 BP tera STAB floor kicks in either way after item boosts according to PS and the damage calc. So that's kind of a caveat but you still come out ahead for the most part.
The way Embody Aspect works now is that you get the Embody Aspect boost corresponding to the forme you pick in the teambuilder regardless of Tera type, so Rock/Cornerstone will always get Embody Aspect (Cornerstone) and raise Defense, and the same goes for Fire/Attack, Grass/Speed, and Water/Special Defense.
This is pretty much how it's worked before, except the Ogerpon formes were always forced into their respective tera types. Now, Ogerpon can freely choose between Grass/Fire/Water/Rock under normal circumstances, which would show up ingame with the respective special tera model. As mentioned, probably the most notable application of this is letting the Ogerpon formes stay as Grass types for Flower Veil while still keeping their respective boost, but it's options that Ogerpon didn't have before nonetheless.
But you can still choose other tera types in the teambuilder, and you can even still try to tera. It's just that (usually) in the actual SV game you would enter a softlock by doing so, so instead PS politely alerts with a public message that you tried to softlock the game and doesn't actually tera your Ogerpon.
(Both players attempting to tera an Ogerpon.)
This doesn't use up your tera option though, so you can keep failing to tera on every turn if you want like a taunt.
https://replay.pokemonshowdown.com/gen9metronomebattle-2374093105
But as also mentioned, there are certain other ways to get around this tera type limitation, involving not having Ogerpon's model on the field. This can be done through being an Imposter Ogerpon, which doesn't make you go tera form (and you can't tera if transformed into Ogerpon in general), or more relevantly being an Illusion Ogerpon, which allows you to make use of your own stats and is the other half of the mystery of that replay.
So this particular quote is also untrue now, though it requires a very specific setup. But it is pretty satisfying to say that Illusion is now actually relevant for a mon's performance in a way other than just countering Imposter. Now I probably like Illusion a lot more than it deserves, and have made a point to acknowledge it over the years if you search in the thread. Some of it due to Illusion megas not breaking Illusion due to not having Illusion anymore being a meta thing in hackmons, and some more due to how it names your Illusion when you mega evolve which is still fun to see, and a little bit of Imposter anti-meta as long as you're in slot 1. But ultimately there's just something to having people bear witness to an impossibility when they least expect it with little explanation, and I think that's what Illusion is really all about.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373899806?p2
(Naming the mega stone still pretty much spoils the surprise, but still.)
But yeah, Illusion Ogerpon is free to go Tera Ghost or Tera Stellar or anything as long as its illusion is still up (and it's not also Illusioned into an Ogerpon because then your Illusion would disappear before tera goes through, which is how Zoroark works normally, but if you're also an Ogerpon underneath then you would softlock the game still, I think.)
Thankfully it is pretty obvious from Embody Aspect proccing when you are dealing with an Ogerpon (if you're already aware), more so than if it wasn't a thing, but otherwise the UI doesn't do you many favours here. Also, Illusion doesn't break on hit anymore since the ability is gone, not even on death. Instead, you create a red error message when you faint instead, which I would say is also as good as creating a hint message about not softlocking the game.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373419305?p2
(I think it was longer in the actual battle and also bug reported as I started unleashing it on ladder last night.)
https://replay.pokemonshowdown.com/gen9metronomebattle-2374103153
From the tera user's POV, you see yourself as a normal Stellar/tera whatever mon when hovering over your mon, with the default ability of the illused Mega Venusaur as a supposed base, though Embody Aspect revealing itself should clear that up.
The opponent sees a similar view, though if it's Stellar they would see the (fake) base typing of the Illusion repeated.
Hovering over the minisprites, both players will see Thick Fat as the base ability and Grass/Poison as the current type.
But the switchout display will remind Ogerpon of its true identity if you forget you're playing Ogerpon, not that it really makes a difference at that point.
So this has already added much more options for Ogerpon and Illusion, even if they're not particularly relevant, but also it gives me an excuse to get into more weird Illusion interactions now that it's arguably a meta option as the only way for Ogerpon to use certain tera types.
Illusion Ogerpon Tera + Imposter manual mega evolution:
https://replay.pokemonshowdown.com/gen9metronomebattle-2373890698
- You can go from seemingly 2 Pidgeots on a field with no actual Pidgeots to seemingly 2 Mega Pidgeots within the first turn and I just think that's pretty neat.
- Ogerpon's second tera update animation actually updates Ogerpon's base forme illusion into the mega evolution if you check out the replay.
Another note I stumbled upon is that Ogerpon is illusioned as a mon that is currently transformed into an Ogerpon forme, Ogerpon is still subject to its natural Tera type limitations despite not having an Ogerpon sprite, so it can't tera outside of Fire/Grass/Rock/Water. I couldn't tell you if this is exactly accurate behaviour but it's a thing and probably won't come up naturally enough to matter.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373896503
Otherwise if your Imposter partner is not currently an Ogerpon then you can use Illusion-exclusive teras just fine, though Ogerpon does not update into whatever the Imposter has become. I would guess it would only reflect natural form change updates in that sense?
https://replay.pokemonshowdown.com/gen9metronomebattle-2373893208
If you have an Illusion mega and an Imposter mon instead, you do get some name confusion with the Imposter's current species when you mega evolve:
https://replay.pokemonshowdown.com/gen9metronomebattle-2373897810?p2
Well, this is actually kind of getting off track, because it has nothing to do with Ogerpon and is just a general Illusion Mega with Imposter partner thing that I was playing with back in 2018, which doesn't actually happen on cart but it's funny.
Again, running Imposter on Ogerpon doesn't make anything special happen when you tera (compared to Imposter on any other mon), but it means you have another option to run different tera types with Ogerpon if you want to. Though if you needed to win with an off-type tera Ogerpon for a self-imposed challenge or something, I imagine just going Illusion would be easier and more in the spirit of actually using Ogerpon.
So I think that's all I have to say about Ogerpon's new mechanics and niche Illusion setups for now, feel free to let me know if there's anything else I missed.
EDIT:
Adding on to the "Illusion illusioned as an Imposter mon that is Impostered into an Ogerpon" case, using a valid tera like Grass will force the Illusion to wear off as if you were illusioned as Ogerpon directly.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373892155
This Illusion wearing off bit also happens if your Illusion mon isn't even Ogerpon to begin with.
https://replay.pokemonshowdown.com/gen9metronomebattle-2374142244
But if your Imposter happens to be able to mega evolve and not be an Ogerpon anymore, then it's fine.
https://replay.pokemonshowdown.com/gen9metronomebattle-2374143676
So I guess Ogerpon can kind of mess up how this Illusion Imposter combo works against itself to boot, though I feel like there's some kind of uncharted edge right now to PS treating the Illusion as if it was a direct Illusion of Ogerpon because the Imposter being illused is currently an Ogerpon even though the original/current Illusion wasn't of an Ogerpon at any point.
As Pecharunt has fallen from the format, its rival Ogerpon rises in fitting fashion, so I may as well take this opportunity to write up an updated reference for Weird Ogerpon Mechanics that are surprisingly relevant, since my original 2023 first impression coverage would now be outdated in a couple notable aspects.
Choosing Ogerpon-Hearthflame-Tera and terastallizing makes you an unmon that has no stats. Don't do this.
Ogerpon tera formes terastallizing and having no stats is one half of the key behind that replay, and is not a thing anymore as of the changes made in https://github.com/smogon/pokemon-showdown/pull/10814. Now Ogerpon's tera formes can properly terastallize themselves, so as far as I know there shouldn't be any gameplay difference between picking a base masked forme versus the corresponding Tera forme to start. Or aesthetic difference as of now, since the PS models have no difference, other than how long your name is before you tera.
Only the form you pick in the teambuilder matters for most of Ogerpon's gameplay aspects, and for demonstration, you could try to represent all four elements in one Ogerpon set through forme/item/ability/tera type even if it's completely inefficient:
AWARE (Ogerpon-Cornerstone-Tera) @ Wellspring Mask
Ability: Embody Aspect (Teal)
Tera Type: Fire
EVs: 252 HP / 252 Atk / 252 Def / 252 SpA / 252 SpD / 252 Spe
Lonely Nature
- Metronome
In practice, this Ogerpon will just be a Grass/Rock type with no mask or stat boost, that will be able to go Tera Fire and get a Defense boost from Embody Aspect afterwards.
Ogerpon needs to hold the actual mask corresponding to its forme for the 20% power boost, and the Embody Aspect abilities can't trigger at the start of battle because the user has to be terastallized, so you can't double up on stat boosts like this.
I don't have much to add about the masks, but I did find in testing that there are some cases when the power boosts of these items may not actually affect damage compared to not having them. That is, when the 60 BP tera STAB floor kicks in either way after item boosts according to PS and the damage calc. So that's kind of a caveat but you still come out ahead for the most part.
252 SpA Wellspring Mask Tera Grass Ogerpon-Wellspring-Tera Absorb (60 BP) vs. 252 HP / 252 SpD Ogerpon-Cornerstone: 66-78 (18.1 - 21.4%) -- possible 5HKO
252 SpA Tera Grass Ogerpon-Wellspring-Tera Absorb (60 BP) vs. 252 HP / 252 SpD Ogerpon-Cornerstone: 66-78 (18.1 - 21.4%) -- possible 5HKO
The way Embody Aspect works now is that you get the Embody Aspect boost corresponding to the forme you pick in the teambuilder regardless of Tera type, so Rock/Cornerstone will always get Embody Aspect (Cornerstone) and raise Defense, and the same goes for Fire/Attack, Grass/Speed, and Water/Special Defense.
This is pretty much how it's worked before, except the Ogerpon formes were always forced into their respective tera types. Now, Ogerpon can freely choose between Grass/Fire/Water/Rock under normal circumstances, which would show up ingame with the respective special tera model. As mentioned, probably the most notable application of this is letting the Ogerpon formes stay as Grass types for Flower Veil while still keeping their respective boost, but it's options that Ogerpon didn't have before nonetheless.
But you can still choose other tera types in the teambuilder, and you can even still try to tera. It's just that (usually) in the actual SV game you would enter a softlock by doing so, so instead PS politely alerts with a public message that you tried to softlock the game and doesn't actually tera your Ogerpon.
(Both players attempting to tera an Ogerpon.)
This doesn't use up your tera option though, so you can keep failing to tera on every turn if you want like a taunt.
https://replay.pokemonshowdown.com/gen9metronomebattle-2374093105
But as also mentioned, there are certain other ways to get around this tera type limitation, involving not having Ogerpon's model on the field. This can be done through being an Imposter Ogerpon, which doesn't make you go tera form (and you can't tera if transformed into Ogerpon in general), or more relevantly being an Illusion Ogerpon, which allows you to make use of your own stats and is the other half of the mystery of that replay.
Overall Ogerpon may end up relatively limited in terms of its options in Metronome depending on how things go, since it will be the only mon physically unable to go Tera Ghost
So this particular quote is also untrue now, though it requires a very specific setup. But it is pretty satisfying to say that Illusion is now actually relevant for a mon's performance in a way other than just countering Imposter. Now I probably like Illusion a lot more than it deserves, and have made a point to acknowledge it over the years if you search in the thread. Some of it due to Illusion megas not breaking Illusion due to not having Illusion anymore being a meta thing in hackmons, and some more due to how it names your Illusion when you mega evolve which is still fun to see, and a little bit of Imposter anti-meta as long as you're in slot 1. But ultimately there's just something to having people bear witness to an impossibility when they least expect it with little explanation, and I think that's what Illusion is really all about.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373899806?p2
(Naming the mega stone still pretty much spoils the surprise, but still.)
But yeah, Illusion Ogerpon is free to go Tera Ghost or Tera Stellar or anything as long as its illusion is still up (and it's not also Illusioned into an Ogerpon because then your Illusion would disappear before tera goes through, which is how Zoroark works normally, but if you're also an Ogerpon underneath then you would softlock the game still, I think.)
Thankfully it is pretty obvious from Embody Aspect proccing when you are dealing with an Ogerpon (if you're already aware), more so than if it wasn't a thing, but otherwise the UI doesn't do you many favours here. Also, Illusion doesn't break on hit anymore since the ability is gone, not even on death. Instead, you create a red error message when you faint instead, which I would say is also as good as creating a hint message about not softlocking the game.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373419305?p2
(I think it was longer in the actual battle and also bug reported as I started unleashing it on ladder last night.)
https://replay.pokemonshowdown.com/gen9metronomebattle-2374103153
From the tera user's POV, you see yourself as a normal Stellar/tera whatever mon when hovering over your mon, with the default ability of the illused Mega Venusaur as a supposed base, though Embody Aspect revealing itself should clear that up.
The opponent sees a similar view, though if it's Stellar they would see the (fake) base typing of the Illusion repeated.
Hovering over the minisprites, both players will see Thick Fat as the base ability and Grass/Poison as the current type.
But the switchout display will remind Ogerpon of its true identity if you forget you're playing Ogerpon, not that it really makes a difference at that point.
So this has already added much more options for Ogerpon and Illusion, even if they're not particularly relevant, but also it gives me an excuse to get into more weird Illusion interactions now that it's arguably a meta option as the only way for Ogerpon to use certain tera types.
Illusion Ogerpon Tera + Imposter manual mega evolution:
https://replay.pokemonshowdown.com/gen9metronomebattle-2373890698
- You can go from seemingly 2 Pidgeots on a field with no actual Pidgeots to seemingly 2 Mega Pidgeots within the first turn and I just think that's pretty neat.
- Ogerpon's second tera update animation actually updates Ogerpon's base forme illusion into the mega evolution if you check out the replay.
Another note I stumbled upon is that Ogerpon is illusioned as a mon that is currently transformed into an Ogerpon forme, Ogerpon is still subject to its natural Tera type limitations despite not having an Ogerpon sprite, so it can't tera outside of Fire/Grass/Rock/Water. I couldn't tell you if this is exactly accurate behaviour but it's a thing and probably won't come up naturally enough to matter.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373896503
Otherwise if your Imposter partner is not currently an Ogerpon then you can use Illusion-exclusive teras just fine, though Ogerpon does not update into whatever the Imposter has become. I would guess it would only reflect natural form change updates in that sense?
https://replay.pokemonshowdown.com/gen9metronomebattle-2373893208
If you have an Illusion mega and an Imposter mon instead, you do get some name confusion with the Imposter's current species when you mega evolve:
https://replay.pokemonshowdown.com/gen9metronomebattle-2373897810?p2
Well, this is actually kind of getting off track, because it has nothing to do with Ogerpon and is just a general Illusion Mega with Imposter partner thing that I was playing with back in 2018, which doesn't actually happen on cart but it's funny.
Again, running Imposter on Ogerpon doesn't make anything special happen when you tera (compared to Imposter on any other mon), but it means you have another option to run different tera types with Ogerpon if you want to. Though if you needed to win with an off-type tera Ogerpon for a self-imposed challenge or something, I imagine just going Illusion would be easier and more in the spirit of actually using Ogerpon.
So I think that's all I have to say about Ogerpon's new mechanics and niche Illusion setups for now, feel free to let me know if there's anything else I missed.
I wanted to point out Shaymin-Sky getting frozen into land Shaymin and getting Natural Cure, but thinking about it that case is more getting your ability/form changed completely involuntarily and unintentionally rather than changing your ability by choice (and the resulting ability has no use). But I still want to point it out because it is another case of a Grass legendary having an innate form change mechanic to it, and I like Shaymin. I'm pretty sure this did happen to me once in Gen 7, as unlikely as it was for Skymin to live an ice move at a point of the battle with Flower Veil down, but that replay is physically lost if it still exists.Ogerpon is the only Pokémon in the format that can change its ability without the use of an item like a mega stone
EDIT:
Adding on to the "Illusion illusioned as an Imposter mon that is Impostered into an Ogerpon" case, using a valid tera like Grass will force the Illusion to wear off as if you were illusioned as Ogerpon directly.
https://replay.pokemonshowdown.com/gen9metronomebattle-2373892155
This Illusion wearing off bit also happens if your Illusion mon isn't even Ogerpon to begin with.
https://replay.pokemonshowdown.com/gen9metronomebattle-2374142244
But if your Imposter happens to be able to mega evolve and not be an Ogerpon anymore, then it's fine.
https://replay.pokemonshowdown.com/gen9metronomebattle-2374143676
So I guess Ogerpon can kind of mess up how this Illusion Imposter combo works against itself to boot, though I feel like there's some kind of uncharted edge right now to PS treating the Illusion as if it was a direct Illusion of Ogerpon because the Imposter being illused is currently an Ogerpon even though the original/current Illusion wasn't of an Ogerpon at any point.
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