4th Gen Is my Magnezone good for the platinum battle factory?

[Lawrence63]

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Pokemon:
I chose Magnezone for a good special attacker, a great buff for water types, and a wall for fire and steel types.
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Moves:
Thunder | A powerful never miss stab move because of rain dance.

Flash Cannon | A 100% Accurate special steel move.

Hidden Power Ground | Hits steel types for super effective damage and Magnet pull makes them stay in.

Rain Dance | To make Thunder never miss and makes fire moves do less damage.
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Ability:
Magnet Pull | Makes it easy to remove steel types since they don't have many weaknesses.
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Item:
Damp Rock | To make Rain Dance last longer.
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Nature:
Modest | The pokemon only uses special attacks and doesn't use physical attacks.
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EV's:
Special Attack | 252 for Max Damage.

Special Defense | 4 because most good fire moves are special.

Speed | 252 so Magnezone can set up Rain Dance and won't immediately get killed by a fire type move.
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[Nah]

You can only use rental Pokemon in the Battle Factory, did you mean a different battle facility?

Thing with weather though is that it's a lot better imo to have something that automatically sets it up rather than spend a turn to do so, especially on a Pokemon that isn't terribly fast or bulky. In Gen 4 your only option for Drizzle is Kyogre though, and box legends often get banned in the various battling facilities.

What other Pokemon are going to be on the team with it, and is this singles or doubles?