Pikachu is the mascotte, you can't do anything about that. Constantly getting Pikachu merchandise, ads and so on is a double edge sword: on one side he's really recognizable, on the other hand true fans start to get tired of him...
Personally I don't mind him, he's got a pretty nice concept, he's cute enough, but he can also be pretty cool:
Probably if I had to do a top 100 Pokémon, or even a top 200 he wouldn't make it simply because there are TOO MANY good pokémon to leave their place to something so simple...
That beeing said Pikachu is my main in smash, not because of him beeing pikachu, but because of how he plays, and of course because he rappresents a franchise I'm really atached to...
Also this :
https://www.youtube.com/watch?v=Pqlo402NlTk
