Sorry for the delay. One of my professors can't speak English so I've kinda been sorting that out. Anyways, for my post...
Offensive CM Suicune
This is a relic set from ORAS, but functions exactly as it did in gen 6. The main idea is to lure in and heavily damage Pokemon that can take advantage of Suicune.
Suicune @ Icium Z / Leftovers
Ability: Pressure
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Calm Mind
- Scald
- Ice Beam
- Substitute
Going over the moveset, calm mind allows you to heavily pressure defensive checks like Amoonguss, and also allows you to take advantage of openings left by offensive teams to get a kill (on things like CB locked Scizor, -2 Latias/Hydreigon, etc.). Scald is still used over hydro pump or surf because of its greater PP and ability to wear down checks, respectively. Ice beam with Icium-Z is the "crux" of this set (like a half-assed smogon analysis would say), and can OHKO Celebi after stealth rocks damage without a boost. Another benefit of this item is that it allows you to OHKO checks like DD+Facade M-Altaria and Taunt Hydreigon. It also does a ton to Latias and Amoonguss, which is nice. If you don't have the room to run Z-move on Suicune, leftovers is still a fine alternative. Moving onto the last move, substitute is nice to allow you to setup on things like Mantine, Toxic+Protect Empoleon, choice-locked Scizor, and other Pokemon like -2 Latias/Hydreigon.
In general, I like this set because it has more utility outside of just luring Celebi. It's a set that has a way to deal with many of Suicune's conventional answers.