How to use Missingno. on Showdown! ?

Question

On Showdown! Missingno. is part of the list of Pokemon that can be used but is always banned. Which format does it have to be on to be usable?

Comments

Uhm, MissingNo. is not a legit "Pokémon" and cannot be classified as one...it is a Glitch Pokémon (meaning that it does not exist through normal gameplay). Also, I do not play "Showdown!" and don't know anything about it...so, I can't help you there. Sorry.

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It might be an Easter egg, or it might be usable in custom games.

Answer 1

It is usable in Gen 1 Custom game

source

Comments

Nevermind my answer, it turns out missingno. can be used in custom battle, but only in  Gen IV+.

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Where is Custom game? I don't see it on the list.

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There's no ladder. To play it, you need to challenge someone to a custom game.

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I'm confused. How do you do that? In the chat room?

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Yeah, or click the 'find user' button.

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I can't find anyone.

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You have to type their exact username on the 'Find User' box.

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I don't even care anymore. As long as I know Missingno. can be used.