Replace Fire Blast with Flamethrower. Fire Blast is too inaccurate for Wi-Fi.
Pretty much the only Normal offensive move worth having is Return. Replace Crush Claw with that and replace the Quick Attack/Pursuit slot with a more powerful and/or versatile move, like X-Scissor, Shadow Claw, Night Slash, etc.. When Platinum comes out, you could try giving it Fire/Ice/Thunderpunch, too.
This one I'm kinda torn on. The moveset itself is fine, but if your team goes up against a Fighting Pokemon, it's gonna get utterly wrecked. Mismagius' resistance is good, but if neither Slowbro nor Mismagius has a Psychic move, you might wanna give this guy a Flying attack.