Pichu
Weedle -> Kakuna -> Beedrill
Hoothoot -> Noctowl
Cyndaquil -> Quilava -> Typhlosion
Chikorita -> Bayleef
Totodile -> Croconaw
Egg -> Togepi -> Togetic -> Togekiss
Heracross
Aipom -> Ambipom
Phanpy -> Donphan
Larvitar
Gligar -> Gliscor
Girafarig
Swinub -> Piloswine -> Mamoswine
Buizel
Gible