Espeon

Espeon is the most important Pokemon on Baton Pass teams thanks to a combination of its ability Magic Bounce, formidable power, and decent Speed tier. If you are just looking for a Magic Bounce user and not a full Baton Pass team, use Mega Diancie or Sableye on offense and balance or stall, respectively. With STAB Stored Power backed up by Baton Passed boosts, Espeon can sweep a large portion of teams. Nothing beats it one-on-one once it has set up, but it sometimes finds difficulty doing so due to its reliance on hax and its terrible stats. It also requires heavy team support in order to function and is near useless on its own.