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This thread allows you to Mitch match the types so long as one of the pokemon being fused has that type.
Skarmory+Moltres. Steel/fire
Aggron+Mewtwo.Steel/psychic
Bisharp+rayquaza.Steel/flying
Jirachi+Machamp.Steel/psychic
Steelix+palkia.Steel/water
Metagross+giratina. Steel/ghost