Name: Garchomp Counter
@Choice Scarf
Bold
128 hp, 100 def, 212 spA, 70 speed
Pressure
-Surf
-Ice Beam
-HP electric
-Extrasensory/Shadow ball
This set is designed to counter most forms of Garchomp, the only one it can't counter is the bulky salac sweeper set.
Yache Chomp: Switch in on pretty much anything and 2HKO with ice beam. The EVs on this set allow it to survive a Swords Danced Adamant Outrage approx 97% of the time. Most are Jolly anyway though, so don't let that 3% chance discourage you.
LO Chomp: Same as above. While this can't survive a +2 LO outrage, it won't have to as long as you switch in on the turn it swords dances. KO with ice beam.
Band Chomp: Switch in and take a maximum of 75% from Adamant Outrage and kill with Ice Beam.
Scarf Chomp: Switch in on any attack. This will survive 2 of anything Scarf Chomp has to throw at it while you kill with Ice Beam.
Chain Chomp: Survive any attack, KO with Ice Beam.
Bulky Salac Sweeper: Unfortunately, you can't counter this set. Garchomp will beat you to the 2HKO and you can't outrun it after Salac activates. The best you can do is get it's health down low enough so something faster or something with a priority move can revenge kill it.
SubChomp: If it subs while you switch in, break the sub while it either attacks or swords dances. If it swords dances you can survive an outrage and KO with ice beam the next turn since you're faster and it won't have a chance to sub again. If it attacks you after you switch in, simply kill it. Just hope you get lucky if Sand Veil is in effect though, since this set is mostly used with sandstream support.
Shadow Ball/Extrasensory is filler because Suicune doesn't have many other options as a scarfer.
EVs: As explained earlier, 269 spA lets you OHKO Garchomp with Ice Beam. The HP and Def give you bulk to survive a +2 Adamant Outrage about 97% of the time. 70 speed EVs grants you 334 speed, enough to outrun Jolly Garchomp.