Do I purify my shiny Ho-Oh?

Just got the shiny on my 7th raid. So happy with it. Do I keep the shadow shiny or purify? I know shadow’s are really good to keep generally, so curious on what you guys think

Just got the shiny on my 7th raid. So happy with it. Do I keep the shadow shiny or purify? I know shadow’s are really good to keep generally, so curious on what you guys think