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Fair enough and well said. I believe it is fair Arceus Typeless to be added.
Dorron's commentary in conjunction with the UltramewtwoZ comment above are points to consider, aren't they?
Even though it was removed from the PS, the fact that the movement of Magikarp's revenge could not be used outside Custom Game did not prevent the staff from creating the movement. And even if this is a special case, what Dorron says is still worth in this sense and in this context:
"Wouldn't it be usable in a hypothetical DPP Pure Hackmons metagame? Eternamax was added when PH wasn't a thing."
Paleo Wave and Shadow Strike are also special, even they are different cases too. Arceus Typeless is another special case, also different. Eternamax be added before Pure hackmons be a thing, it is also special. Being a special case does not prevent something from being added by itself. If even things like Paleo Wave, Shadow Strike and in the past Magikarp's Revenge that didn't even exist in the games, were added, Arceus Typeless deserves it too, even more because it is not a personalized creation for the Pokémon Showdown.
Also, note that this is not banal. Look how much replies this topic has already received, even though it was created in 2019 it is still alive. Not to mention the views too. Don't we deserve this? This is not something that we have no interest. Is it so really impossible to add this?
Please, administrators/staff ! Make this dream a reality for us. I beg! Are we not showing enough interest yet? Then i will ask Jirachi a wish.
Jirachi, use Wish. I wish Arceus Typeless will become a reality at the Pokémon Showdown!
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I did my best. Let's pray with Jirachi.