LOL, How can people chose Mijumaru for the most potential when we don't even know his moves, his personality, or his attacks, victories, loses, etc.
Dude seems to love to fight like Buizel and is a starter, its kinda of just speculation but the writers tend to focus on those "i like to figth" pokemons, Buizel, Infernape, Charizard, Sceptile.
I see potential in him.
If i have to choose the current powerhouse i would have to say Buizel tied with Corpish, Totodile can appear and defeat 1 or 2 huge guys and become one just like Squirtle who was kinda useless in his Kanto run same with Kingler i dont credit Kingler much because i have not yet seen him perform in this new kind of writing and animation.
Still once again all of them have potential to be Sceptile, Infernape, Charizard, Snorlax, Pikachu level, specially the starters the writers just have to make them beat something to put them at that level in everyone minds.
I agree with you also, Totodile line has a lot of moves and can be very versatile and it would be easy to make him a monster if the writers wanted, still they wont make a little thing if it isnt Pikachu be a monster so he would have to evolve first and its not likely now until next league maybe.