+ Recover + 15 DEF
One of the two personal favorites as this allows it to be a good bulky CM sweeper or just be an offensive monster with smth like 3 attacks + recover as it has a good typing and good attacks its just hindered by its lack of bulk on the physical side which can easily be taken advantage of but not really rn as 80/89 bulk is passable and with ev's it can live most hits from neutral attacks even powerful ones. I believe this to be pretty darn good into non slowking-g, toxapex, and stall MU's
+ Fairy type + Nature Madness (STAB) + 20 HP
Yay a spinner with regen, with 80/90/120 bulk this allows it to check many rockers and threaten to wear them down via leech seed, nature madness as well which can rack up a ton of residual damage as nature madness pressures the opponent into recovering and no pokemon would want to switch into it such as heatran, ferro, corv, melm, victini, and more all dislike having their hp halved esp with leech seed potentially cutting into all of them. I feel this can be a good addition
+ Fairy type (Replaces Psychic) + Moonblast (STAB) + Flower Veil
Can see what was happening here... I doubt it will strive away from defensive sets or CM sets because now it can wall a good amount of pokemon with a much superior typing and moonblast allows it to hit darks and dragons it was walled by before and EP can get the rest. Flower veil gives it an even better stall MU as u cannot even force it out via toxic since its now completely immune
+ Focus Blast + Trace
hmmmmmmmmmmmmmmmmmmmmmm.......... yeah i have an idea of what they were going for a pokemon that can abuse trace for shit like intim, trace, flash fire, pressure, etc sounds nice and helpful in some MU's but the big thing is steel coverage which allows it to exert more pressure esp with its strong sp. attack and the ability to make uncomfortable situations with future sight + hurrucane and focus blast.

+
Glare + 20 SPE
Idk how at all glare helps regidrago of being absolutely stone walled esp since half of them do not even get para'ed or majorly effected which are tapu koko, tapu fini, clef... it still feels like it doesnt od that much and all it takes is a half hp latias or clef to wall the crap of it. Latias still walls it and if u wanted smth that could spred para's to steels and fairies you could have chosen t wave ferro, clef, or any other pokemon as this pokemon is still bad and +20 spe doesnt solve its issue of being hard walled by every steel and fairy