So far, I have maxed 26 mons and only two are lower than 96%: a shiny 91% Raikou and a 93% SD Tyranitar (which I now regret having acquired two perfect purified Larvitars).
I was a F2P player during Moltres raid day, so my best SA Moltres is only 84%. After second charged moves were introduced, Moltres with SA+OH became a top gym attacker (Metagross is an elite and very common defender, while Grass, Bug and Fighting types are also popular). It is also a top counter to Grass Rocket Grunts (RL is an OP move).
For months, I have been trying to become Lucky Friends with my only Best Friend with a SA Moltres, but to no avail. I have a 98% Litwick and 200 candy, but no Unova Stone.
The Regis, Cobalion and Arlo have increased the need for Fire attackers. With with WA in its movepool (and many FTMs to spare), Moltres will also be the top counter to Virizion (which I severely lack counters for). If Shaymin and Genesect become raid bosses…
Stardust is not a problem; I have over three million saved up for Gen 5. What holds me back? Rare Candy, Reshiram and principled fear. 282 Rare Candy (182 to max out + 100 to unlock second charged move) is a lot. I have almost 500, which appears enough…until Giratina-O returns (my best is also 84%) and Landorus-T, Reshiram and Zekrom arrive.
If Moltres with SA becomes obtainable again or I eventually get that Lucky Friend, I may really regret maxing out an 84% one. On the other hand, if neither happens, Reshiram only comes after its best use has passed and I have equally back luck with it, I may regret never really using Moltres. In RBY, Moltres only came before the Elite Four and its typing was poor against them.