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Deoxys (Speed) is a mythical Psychic Pokémon. It is vulnerable to Bug, Ghost and Dark moves. Deoxys's strongest moveset is Zen Headbutt & Thunderbolt and it has a Max CP of 2,879.
"The DNA of a space virus underwent a sudden mutation upon exposure to a laser beam and resulted in Deoxys. The crystalline organ on this Pokémon's chest appears to be its brain."
Despite lacking STAB, Charge Beam is more preferable due to its significantly higher energy generation. Zen Headbutt is underwhelming even with STAB.
Psycho Boost is the primary charge move for Deoxys Speed Forme due to its low energy cost and high DPE rating backed by STAB. Thunderbolt is a good move in PvP and offers some form of coverage against various common Pokemon. Swift performs very poorly in PvP.
Deoxys Speed Forme currently can only be obtained from EX raids, and with a minimum floor IV of 10/10/10 it's not even possible for SPD Forme to be eligible for Great League. Maybe one day it'll be released in research breakthrough or possibly allowed to be traded.
Deoxys Speed Forme doesn't perform as well as its Defence Forme in PvP due to a lack of bulk and a worse moveset. While Deoxys SPD Forme can get to some of its charge moves slightly faster due to greater energy gains from Charge Beam, not having access to the significantly more powerful fast move Counter is way more impactful. Overall a disappointing choice for PvP as it can't endure hits like its DEF Forme, and doesn't pose much threat if its charge moves get shielded.
Ultra League is mostly comprised of Giratina who wrecks most of their opponents, hard counters against Giratina, and then a mess of competitors who try to counter either or both. Unfortunately Deoxys SPD Forme doesn't fit well into this meta which makes it less compelling to use for Ultra League.
Deoxys SPD Forme has a max CP of 2879, which is quite insignificant in comparison to many of the major players in Master League. With a very poor win ratio against most meta picks in this league, the only thing Deoxys does fast is lose.
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