Which is better Blastoise or feraligatr?

Answer 1

It depends whether you want a strong attacker or a Pokemon that just screws the opponent over.

Feraligtr is a good Pokemon to have if you don't have very many offensive Pokemon on your team, although it's type is not very good seeing that it is a physical water-type Pokemon. If you do want to get a Feraligtr, teach it only physical moves and throw in Ice Punch, too.

Blastiose is a Pokemon that can be used to screw the opponent over. Use Blastoise as a defensive Pokemon (Defense and Special Defense). Teach Blastoise moves that will tick the opponent off, like Toxic. Also teach Blastoise moves like Hydro Pump or Hydro Cannon so that it can deliver a punishing blow. Also teach it a move that will boost Special Attack.

Overall I'd go with Blastoise. Its Defense and Special Defense make it a useful "wall" in a Pokemon team.