I have added all Pokemon from generations 1-8 as emotes to the forum. I excluded most alternate formes to cut down on sheer amount of emotes, but I can re-add any by request. Megas that existed pre-generation 10 are also included.
Until I set up a full list, here's how to access them, as I have hidden them from the emoji picker due to there being over 900. Hover over the sprites to see the smiley code.
Normal Pokemon
:pikachu::pikachu: :bulbasaur: :piplup:
Pokemon with spaces or non-alphanumeric characters in their names
:nidoran-f::nidoran-f: :type-null: :tapu-koko: :mime-jr:
Mega Evolutions
:abomasnow-mega::abomasnow-mega: :kyogre-primal: :charizard-mega-x:
Regional Forms
:vulpix-alola::vulpix-alola: :exeggutor-alola:
Unown
:unown-b::unown-g: :unown: :unown-y: :unown-exclamation: :unown-question:
Note that Unown A is considered default, and doesn't have a letter in its file name.
I have cropped them a second time to try to limit the amount of space they take up. I will try to find the minimum size. Unfortunately, Melmetal is much larger than any other sprite due to being a weird Pokemon created between the transition to the Switch era, but it's basically an event Pokemon, so who cares.
The tallest sprite is :xerneas: and the longest sprite is :charizard-mega-x:.
:melmetal: Instead of bulk cropping them to the same sizes, I will make exceptions for the large, special sprites.
Additionally, the emote codes are case-sensitive.