It really depends on what game.. There are different codes that only work for certain games.
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breed a ditto with a spiritomb
add a Spiritomb with wonderguard (Spiritomb has no weakness and Wonder guard stops unsuperaffective attacks hitting you.)
No
Spiritomb is Ghost and Dark Type. Extra Information: To catch Spiritomb, you need to place an Odd Keystone in the Hallowed Tower in Route 209 and have 32 conversations with a friend underground (You will catch Spiritomb in 25 lv.) Hope I helped :)
I pretty sure you can get Spiritomb with it.