>>55773735This is a fun idea, OP.
>pikachuAmpharos is the obvious choice but actually Elekid has very similar base stats to pikachu and he gets even better moves like the elemental punches.
>talking about togekissOh wait you're playing gen 4 so elemental punches are move tutors. Sad.
But if you just wanna not evolve him that's pretty much THE Johto equivalent of Pikachu.
>snorlaxHe's pretty unique but the closest in theme may be Ursaring. Big bear with big physical attack. He isn't anywhere near as bulky, but its johto. Miltank is a little bulkier and gets milk drink. Its a good mon.
>laprasYeah I would go for Kingdra. Or you could channel his G/S/C battle and go for Umbreon or Espeon since he has an Espeon in the original game. Unfortunately all the johto new ice types are complete garbage at least until you can evolve to Weavile and Mamoswine, which I'm not sure when you can do that. As far as a unique water type, Kingdra is the best one and he's super cool.