I'll likely create a thread for each generation seperately as to not make discussion too messy. Anyone interested can weigh in...I did have tons of offer for help and appreciate it, but in order to keep this one centralized I'd like to keep the final say on all of it.
Criteria and guidelines for in-game tiers:
The best possible Pokemon is one that is obtained at the start of the game, can OHKO enemies off the bat, and takes 1 hp damage from everything, while also learning every possible HM, heals itself automatically, and has some neat ability to top it off. Such a Pokemon doesn't exist, of course, but this means that Pokemon closer to this ideal are the best ones possible.
The goal of this in-game tier list is to recommend a select group of Pokemon for an efficient run through of the game. Those will be put in High tier. Very inefficient Pokemon will be put in Low. Things that are neither efficient nor inefficient, for example Pokemon that have some opportunity cost but end up as good as High ones, will be put in the Middle.
Resources are available, but come with the cost of not being able to give it to other Pokemon. Giving Super Potions is fine because you can buy them and you have almost infinite money in the game. Giving a Pokemon a TM like the Dig in RBY cannot simply be assumed as there is likely lots of competition for it. The less competition there is for a TM, the more likely it is that the Pokemon in question can get said TM. A buyable TM can always be assumed, of course.
Don't confuse an efficient run with a speed run. Speed runs are often segmented and recorded runs with luck manipulation through resets, and aim for the absolute fastest time, but the real time spent on them is usually much, much more. Just assume you want to play through in a relatively low time frame.
Team size is actually by far most efficient if you use one member, but I'm assuming something more like 3 members as otherwise you get extremely centralized lists with starters and earlygame Pokemon at the far top and everything else is pretty much too shitty to bother with.
Here is a start of the RB tier list Altmer and I have worked on. Yellow is different enough to make a different list or to denote something about it when the RB one is done.
High
Bulbasaur
Charmander
Squirtle
Spearow*
Pikachu
NidoranF
NidoranM
Diglett (+Dugtrio)
Abra
Geodude
Doduo*
Staryu
Mr. Mime
Snorlax
Zapdos
Mid
Caterpie
Rattata*
Sandshrew*
Clefairy
Jigglypuff
Oddish
Meowth
Psyduck*
Mankey
Poliwag
Bellsprout
Slowpoke*
Farfetch'd*
Gastly
Drowzee
Exeggcute
Rhyhorn
Jynx
Magikarp
Lapras
Vaporeon
Jolteon
Articuno
Low
Weedle
Pidgey
Ekans
Vulpix*
Zubat
Paras
Venonat
Growlithe*
Machop
Tentacool
Ponyta
Magnemite
Seel
Grimer
Shellder
Onix
Krabby
Voltorb
Cubone
Hitmonlee
Hitmonchan
Lickitung
Koffing
Chansey
Tangela
Kangaskhan
Horsea
Goldeen
Scyther
Electabuzz
Magmar
Pinsir
Tauros
Ditto
Flareon
Porygon
Omanyte
Kabuto
Aerodactyl
Moltres
Dratini
Not tiered
Mewtwo
Mew
Spearow: possible drop to Mid
Rattata: possible raise to High
Sandshrew: possible raise to High
Psyduck: possible drop to Low
Vulpix/Growlithe: possible raise to Mid
Slowpoke: possible drop to Low
Farfetch'd: possible drop to Low
Doduo: possible drop to Mid
I'd appreciate input on these, as Altmer and I were somewhat doubtful on them:
Spearow: possible drop to Mid (I lean towards High, Altmer Mid)
Rattata: possible raise to High (I lean towards High, Altmer Mid)
Sandshrew: possible raise to High (I lean towards High, Altmer Mid)
Psyduck: possible drop to Low (unsure)
Vulpix/Growlithe: possible raise to Mid (unsure)
Slowpoke: possible drop to Low (much like Psyduck)
Farfetch'd: possible drop to Low (I lean towards Mid, Altmer Low)
Doduo: possible drop to Mid (unsure)
Criteria and guidelines for in-game tiers:
The best possible Pokemon is one that is obtained at the start of the game, can OHKO enemies off the bat, and takes 1 hp damage from everything, while also learning every possible HM, heals itself automatically, and has some neat ability to top it off. Such a Pokemon doesn't exist, of course, but this means that Pokemon closer to this ideal are the best ones possible.
The goal of this in-game tier list is to recommend a select group of Pokemon for an efficient run through of the game. Those will be put in High tier. Very inefficient Pokemon will be put in Low. Things that are neither efficient nor inefficient, for example Pokemon that have some opportunity cost but end up as good as High ones, will be put in the Middle.
Resources are available, but come with the cost of not being able to give it to other Pokemon. Giving Super Potions is fine because you can buy them and you have almost infinite money in the game. Giving a Pokemon a TM like the Dig in RBY cannot simply be assumed as there is likely lots of competition for it. The less competition there is for a TM, the more likely it is that the Pokemon in question can get said TM. A buyable TM can always be assumed, of course.
Don't confuse an efficient run with a speed run. Speed runs are often segmented and recorded runs with luck manipulation through resets, and aim for the absolute fastest time, but the real time spent on them is usually much, much more. Just assume you want to play through in a relatively low time frame.
Team size is actually by far most efficient if you use one member, but I'm assuming something more like 3 members as otherwise you get extremely centralized lists with starters and earlygame Pokemon at the far top and everything else is pretty much too shitty to bother with.
Here is a start of the RB tier list Altmer and I have worked on. Yellow is different enough to make a different list or to denote something about it when the RB one is done.
High
Bulbasaur
Charmander
Squirtle
Spearow*
Pikachu
NidoranF
NidoranM
Diglett (+Dugtrio)
Abra
Geodude
Doduo*
Staryu
Mr. Mime
Snorlax
Zapdos
Mid
Caterpie
Rattata*
Sandshrew*
Clefairy
Jigglypuff
Oddish
Meowth
Psyduck*
Mankey
Poliwag
Bellsprout
Slowpoke*
Farfetch'd*
Gastly
Drowzee
Exeggcute
Rhyhorn
Jynx
Magikarp
Lapras
Vaporeon
Jolteon
Articuno
Low
Weedle
Pidgey
Ekans
Vulpix*
Zubat
Paras
Venonat
Growlithe*
Machop
Tentacool
Ponyta
Magnemite
Seel
Grimer
Shellder
Onix
Krabby
Voltorb
Cubone
Hitmonlee
Hitmonchan
Lickitung
Koffing
Chansey
Tangela
Kangaskhan
Horsea
Goldeen
Scyther
Electabuzz
Magmar
Pinsir
Tauros
Ditto
Flareon
Porygon
Omanyte
Kabuto
Aerodactyl
Moltres
Dratini
Not tiered
Mewtwo
Mew
Spearow: possible drop to Mid
Rattata: possible raise to High
Sandshrew: possible raise to High
Psyduck: possible drop to Low
Vulpix/Growlithe: possible raise to Mid
Slowpoke: possible drop to Low
Farfetch'd: possible drop to Low
Doduo: possible drop to Mid
I'd appreciate input on these, as Altmer and I were somewhat doubtful on them:
Spearow: possible drop to Mid (I lean towards High, Altmer Mid)
Rattata: possible raise to High (I lean towards High, Altmer Mid)
Sandshrew: possible raise to High (I lean towards High, Altmer Mid)
Psyduck: possible drop to Low (unsure)
Vulpix/Growlithe: possible raise to Mid (unsure)
Slowpoke: possible drop to Low (much like Psyduck)
Farfetch'd: possible drop to Low (I lean towards Mid, Altmer Low)
Doduo: possible drop to Mid (unsure)