Max IV Aggron and misc
I just caught a perfect IV weather boosted Aron that I promptly (perhaps stupidly?) evolved to an Aggron with Dragon Tail and Stone Edge.
I don’t know what to do with it though. Max it? Stardust is limited so I need to prioritize. 100% is Nice but according to Gamepress Aggron is not very relevant and quite weak. Should I TM? Also haven’t got a big batch of those.
Another general question: how important is the Health stat? Is a Pokémon with say 7 as a health stat but double 15 for attacking and defense interesting to power up? I ask because the health differences seem pretty small and thus inconsequential.
It's not THAT bad though. Makes a pretty good defender against gyms with strong anti-Machamp/Ground setups such as Dragonite/Gardevoir, and has great Quick Move options and Heavy Slam with a TM. Also makes a decent attacker in terms of potion efficiency - a maxed one can even solo a maxed Blissey just before the time runs out.
Don't spend resources on it, it's not that useful. Spoken from experience, I have a 100% Aggron maxed and it's stayed at 0hp for two months straight except for the 2 challenge solos against Jynx that I revived it for.
HP directly contributes to how long your mon stays alive, as does def. 15 for both ensures maximum survivability and the differences definitely matter.
It's far better to power up a min Rayquaza (10/10/10) than a max Aggron. So unless you have powered up EVERYTHING else that's useful, keep it as a trophy, but pass on the power-ups.
My two strong Aggron were both caught as weather buffed Aron, and evolved with no power ups. Not worth any dust. Somewhat useful as is.