It was a Chandelure and the background was golden also, it was a purple light instead of pink does that mean it’s stronger than usual?
If a raid is gold, that Pokémon is guaranteed to have perfect IVs to the star level. If I had a 5 star, gold background raid, then it would have at least 5 IVs.
Yes, if it is a purple raid, the Pokémon inside is rarer. Source: https://www.serebii.net/swordshield/maxraidbattles.shtml