Trample and blitz plus the ability to return it to the battlefield if it dealt damage to a player are a great mix of abilities to put pressure on an opponent while also drawing cards
You can also use cards like Brutal Hordechief and Commissar Severina Raine to push damage while attacking
The abundance of Sylvan Libraries also were promising in this matchup too
First and foremost is the focus on Eevee and its evolutions, which have consistently been among the most popular Pokmon in the franchise
As far as strategy goes I would definitely try and get Dragonite ex as your active Pokemon as soon as possible, I wouldn't ever use Deafen if I could avoid it, I would always stick with Dragon Roar because with Deafen preventing your opponent from using trainers isn't that big a deal because you can always find ways to heal your Pokemon without them, if it be other Poke-Powers or Poke-Bodies or Supporter Cards
While the ability to shut off swampwalk isnt going to come up very often, the other half of the ability will be relevant every few games