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Honestly, I think almost every shiny this generation is a strong shiny. The pseudo being so bright and unrealistic is almost a spit in the face of anyone who complained about Garchomp, which is fine by me. But it's also the only one I would say is at all unappealing. The subtler tone shifts are done well (Vulpix, Sandslash, etc.), the more intense ones aren't gross or are thematically done (Bewear, Lurantis, Mimikyu, etc.), and the "change one color" ones look pretty sweet as well (UB02, Luchalitten, etc.)
Favorite is probably Vikavolt though