It doesn't really lower evasiveness per se.
It "raises" the opponent (in the same way Magnet Rise or Levitate does for the user), then all attacks have ∞ accuracy for 3 turns so they won't miss.
How to change your username
How to add a user avatar
Why was my post hidden?
Flags vs Downvotes
Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.