Speed Reduction After Pokémon Uses Move or Buddy Move on Opponent
Passive Skill
Impeding Strike 1–8
Has a chance (X%) of lowering the target's Speed by one stat rank when the user's Pokémon uses a move targeting that opponent. Has a chance (X%) of lowering the target's Speed by one stat rank after using the user's sync move targeting that opponent.
Impeding Strike 9
Lowers the target's Speed by one stat rank when the user's Pokémon uses a move targeting that opponent. Lowers the target's Speed by one stat rank after using the user's sync move targeting that opponent.
Impeding Strike (Japanese: 相手にＰ技Ｂ技後素早さ↓Speed Reduction After Pokémon Uses Move or Buddy Move on Opponent) is a family of skills in Pokémon Masters EX.
Effect
When the sync pair's Pokémon successfully uses a move or sync move, it has a chance of lowering the target's Speed by one stat rank. The skill can range from Impeding Strike 1 to Impeding Strike 9, with higher numbered skills resulting in a higher chance of activation. Impeding Strike 9 will always lower the target's Speed. Currently, only Impeding Strike 9 is available on scoutable sync pairs. The skill applies to the Pokémon's moves, including status moves and buddy moves, but not max moves.
buddy moves, but not 
max moves.
