I have to agree with u. I like raising Lucario in my games, and Riley and Lucario together are awesome. So really, there's no other choice I would go with than them! :)
Ash and Pikachu are x) though I like Dawn and Piplup too..though even I say nobody can beat the things Ash and Pikachu have been through,they've been through it all together good,bad and worse.