32+ Atk Miracle Seed Rillaboom Grassy Glide vs. 2 HP / 0 Def Sneasler: 45-54 (28.6 - 34.3%) -- 2.3% chance to 3HKO
How damage works in Pokémon Champions
Champions runs every battle at level 50 with IVs fixed at 31, and it swaps EVs for Stat Points. You get 66 to spend and up to 32 in one stat, and each point adds exactly 1, so HP is base + 75 + points and every other stat is base + 20 + points before the nature multiplier. The stat column above uses that formula, so it shows the number you'll see in game. Paste a Showdown set that still uses EVs and it's converted at 8 EVs to a point, so 252 becomes 32.
There's no Terastallization. One Pokémon per team can Mega Evolve instead, and the picker holds the Regulation M-C roster, every allowed Mega included. The board opens in doubles, the format of the VGC ladder, with Rillaboom (32 HP / 32 Atk / 2 Spd, Miracle Seed) against Sneasler, the two most used Pokémon there.
For tiers built from the same ladder see the Champions tier list, and to put a team together use the Champions team builder.