Closed Competitive Landorus

[MadCow17]

Hey as the title says, I am looking for a competitive Landorus it doesn't have to be 6ivs as long as the one not perfect is Sp.Atk. for trade i have a few things.

Shiny Abomasnow: 6ivs-Modest-Soundproof- Sp.Atk:252 Hp:252 Def:4
-Icy Wind -- Giga Drain -- Ice Shard -- Protect

Shiny Sharpedo: 5ivs-Adamant-Speed Boost- Atk:252 Spe:252 Hp:4
-Ice Fang -- Crunch -- Protect -- Earthquake

Shiny Deino: 5ivs-Timid-Hustle- Not Ev Trained.
-Tackle -- Dragon Rage -- Earth Power -- Dark Pulse

Then i have a few of the event pokemon that are not competitive
-Manaphy 20th Anniversary
-Zygarde 2016 OT: Descartes
-Mew 20th Anniversary
-Jirachi 20th Anniversary
-Shaymin 20th Anniversary
-Celebi 20th Anniversary
-Dragonite Ot:lance Kanto Classic Reward

 

[EmmyRie]

My apologies for asking, I am fairly new to the recent Pokemon franchises, how exactly is one able to determine the iv?