What do you think is the best leader and partner pokemon?

well i think TODODILE & CHARMENDER WOULD MAKE A GREAT TEAM

The one that I chose were mudkip and cyndaquil. An amazing combo now that I have a lvl83 swampert and a lvl79 typhlosion. I am defeating pretty much everything with these two.

Chikorita and Charmander! Although it's hard to beat Dialga at first. It takes four or five tries, but still!

-DragladeFan

i ALWAYS Choose Piplup as Leader and Chickorita as Starter!
Piplup has pretty good special attack while Chikorita can take a beating

I think Cydnaquil is good as a leader and Pikachu is good as a partner;Cydnaquil will evolve into Tyfolshion (sorry if spelling in inncorect)and Pikachu will evolve into Raichu (not like im gonna let that happen!)

i say skitty/munchlax as leader and pikachu as partner

How can you defeat dialga with pikachu ?

and

Pikachu learns Focus Punch, that kills everything out there
I usually choose Skitty as Leader and Pikachu as partner. Skitty learns Sing and other useful moves, as well as having STAB on all her attacks. Pikachu learns Thunderbolt to affect multiple targets as well as Focus Punch that helps kill Dialga (took only 3-4 hits from both of them)