X Sp. Def 2 is an item in the “Miracle shooter” category (Battle Items).
In-game descriptions
| Black / White · Black 2 / White 2 · X / Y · Sun / Moon · Ultra Sun / Ultra Moon · Let’s Go, Pikachu! / Let’s Go, Eevee! · Sword / Shield | It sharply raises the Sp. Def stat of a Pokémon in battle. It wears off if the Pokémon is withdrawn. |
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Where to find it
Not placed on the atlas maps (so far: Red/Blue and Generation 3).
Sources : PokeAPI (items, item_flavor_text, machines) · atlas · pokeemerald species_info.h