• red (first played ~1997): charmander
  • have since become a bulbasaur main, sorry lil flamey boi
• yellow (fp ~'99): pikachu
  • obviously
• gold (fp ~'99): cyndaquil
  • played a japanese rom with minimal fan translations so i always end up forgetting this one isn't named hinoarashi
• crystal (fp ~'01?): honestly don't remember but probably cyndaquil again
• sapphire (fp ~'14?): torchic
  • good birb
• pearl (fp '08): piplup
  • also good birb
• white (fp ~12): don't remember, honestly could have been any of them!
• x (fp on release day '13): fennekin
• go (fp on release day '16): bulbasaur

haven't played:

• green, blue, firered, leafgreen
• silver, heartgold, soulsilver
• ruby, emerald, omega ruby, alpha sapphire
• diamond, platinum, brilliant diamond, shining pearl
• black, black 2, white 2
• y
• sun, moon, ultra sun, ultra moon
• let's go, pikachu; let's go, eevee
• sword, shield
• legends: arceus
• colosseum
• xd
• battle revolution
• masters ex
• conquest