How about Relincath? Its CBand STAB move is nearly = to a Super Effective Choice Band Seaking's Megahorn when super effective. (225 ~ 240, plus it has Earthquake for Steel types that try and switch in like Dialga).
Qwilfish also deserves mention for being able to outspeed Deoxys-S in the Rain, being the fastest Taunter and Thunder Waver, plus its the fastest Explosion and Destiny Bonder when Rain is active (take that Wobbafett). Qwilfish also absorbs Toxic Spikes, and can even set up Spikes/Toxic Spikes of its own. Perhaps a set like:
Qwilfish: @ Focus Sash
252 Speed, 252 Attack, 4 HP
Adamant
Taunt / Swords Dance
Thunder Wave / Aqua Tail
Spikes / Poison Jab
Destiny Bond / Explosion
Qwilfish also deserves mention for being able to outspeed Deoxys-S in the Rain, being the fastest Taunter and Thunder Waver, plus its the fastest Explosion and Destiny Bonder when Rain is active (take that Wobbafett). Qwilfish also absorbs Toxic Spikes, and can even set up Spikes/Toxic Spikes of its own. Perhaps a set like:
Qwilfish: @ Focus Sash
252 Speed, 252 Attack, 4 HP
Adamant
Taunt / Swords Dance
Thunder Wave / Aqua Tail
Spikes / Poison Jab
Destiny Bond / Explosion