How do explosion moves and victories work in double battles?

Question

Sorry if this a dupe, but this always confuses me. Who would win if a Pokemon were to use an explosion move and it takes out all Pokemon on the battlefield? Would you or your opponent win? Does it matter who uses the explosion move that determines victories?

Comments

Actually, Explosion makes you faint first.

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https://replay.pokemonshowdown.com/gen8doublesou-1332976815

If this is fine as an answer, please tell me.

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That works. Also to be clear the pokemon that uses explosion loses?

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Thanks both me can't decide which to pick as BA...

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You're supposed to be sure of your answer before posting.

Answer 1

The player that uses Explosion will lose. This makes sense because your Pokémon faints first from the move.

Source: https://replay.pokemonshowdown.com/gen8doublesou-1332976815 (If Slower)
(If faster) https://replay.pokemonshowdown.com/gen8doublesou-1333625988

If Ally is slowest in field: https://replay.pokemonshowdown.com/gen8doublesou-1333631825

Comments

What if your ally is the slowest Pokemon in the battle, so it faints after everyone else?

Answer 2

Using Explosion in that sort of scenario will cause the opponent to win. The Pokemon that uses Explosion faints first, then your ally faints next, followed by both opponents. Initially I thought it would be decided by speed, but no.

First replay (The ally Diglett is faster than both opponents)

Second replay (The ally Happiny is slower than both opponents)