Here i'll give you the best match ups.
Bulbusaur: Recommended Partners: Squirtle or Pikachu
Charmander: Recommended Partners: Chikorita or Mudkip
Squirtle: Recommended Partners: Bulbusaur or Charmander
Pikachu: Recommended Partners: Bulbuasaur or Chikorita
Meowth: Recommended Partners: Totodile or Treecko
Psyduck: Recommended Partners: Charmander or Torchic
Machop: Recommended Partners: Pikachu or Totodile
Cubone: Recommended Partners: Cynaquil or Totodile
Evevee: Recommended Partners: Bulbasaur or Pikachu
Chikorita: Recommended Partners: Charmander or Squirtle
Cyndaquil: Recommended Partners: Pikachu or Treecko
Totodile: Recommended Partners: Chikorita or Pikachu
Treecko: Recommended Partners Cyndaquil or Totodile
Torchic: Recommended Partners: Chikorita or Squirtle
Mudkip: Recommended Partners: Torchic or Treecko
Skitty: Recommended Partners: Charmander or Totodile
Well here they are!
Now known as Intoxication.