Shiny Lugia in my team!

I got two shiny shadow Lugias today, and realized my second, better one would be my first shundo ever if I purified it. Is it worth purifying or better as a shadow?

Shiny Lugia by SeviYummy on DeviantArt

Pokemon Go Lugia Counters - How to Catch Lugia - GameRevolution

Pokémon Go' Announces March Events and Additions Including Thundurus and Shiny Legendaries

Shadow Lugia Exclusive Gold Metal Card

✨ Shiny Lugia MaxCP Lv 50 Unlock 3 Moveset Master League PVP. You choose Shiny Lugia. Require You must have You Lv 45 or more, You will get It Lv50.

Pokemon Shiny Lugia MaxCP Level 50 Unlock 3 Moveset Master League PVP Master

SHINY LUGIA HUNT and Playthrough: Pokemon SoulSilver Special

Pokemon GO's First Legendary Is Lugia, Will Start Appearing For Everyone Soon

Shiny Shadow Lugia Debuts In Next Pokémon GO Team Rocket Invasion

Lugia Collection

Pokemon Sword and Shield Lugia 6IV-EV Competitively Trained – Pokemon4Ever

Pokémon Go Lugia raid guide: counters and best movesets - Polygon

Shiny Lugia Global Link (HQ) by Astorgames on DeviantArt

Are Lugia shiny rates broken? : r/TheSilphRoad

Pokemon 6249 Shiny Shadow Lugia Pokedex: Evolution, Moves, Location, Stats