A free online battle sim, so you don't have to spend a ton of time making the perfect 'mon.
Also, check out smogon.com for recommended movesets. I always tweak their sets to my own needs, but most people copy and paste.
For easier navigation, just Google: "Smogon BW (insert pokemon here)". This will give you the up to date info and sets. --- Now playing: Kingdom Hearts 1.5, Radiant Historia Next in queue: Infinite Space, Dragon Quest V, Chrono Trigger, Solatorobo
ALso is it true pikachu one shots groundo with grass knot?
According to this damage calculator... http://pokemonshowdown.com/damagecalc/ ...yeah, it can happen.
252 SpA Light Ball Pikachu Grass Knot (120 BP) vs. 4 HP / 0 SpD Groudon: 316-374 (92.39 - 109.35%) -- 56.25% chance to OHKO --- More of a Pokemon fan than TherianReturns will ever be. Snowflame is greatest comic villain ever made. Shame on DC for letting him fade into obscurity.