Planning for mew2/legendaries

I think that powering up multiple copies of the same mon at this point is not worth it being dust so rare...

With one or two of them I am pretty sure you will have more than enough because raids are something to play with multiple players and the chances are that despite legendary will be probably a lot stronger than the strongest raid boss with 20 people it will still go down pretty fast. Chances are you don't even get to use your 4th pokemon.

I think you are pretty safe with 2 Tyranitar, 1 Gengar, 1 Scizor and 1 Umbreon. You can always use mon like Dragonite to complete your lineup just in case.

Don't forget Golem with RT and SH for double counter against Moltres, Ho oH, Articuno and should be good against Zapdos

Tyranitar is effective vs 9/11 of the legendaries from gen 1 and 2, but diversity is good in case the legendary has an effective move vs tyrannitar.
Golem with rock moves is probably better against the flying legendaries, especially those with double weakness to rock.

I'm pretty good to solo what is possible. I am still lacking a powered up Houndoom and good Golem. I have a maxed out Scizor, but with double steel, so I am going to change that.

I mostly need TMs...but other than that, a couple of good Golems, Houndoom, maybe a dark Gary or Arcanine. I am also going to continue to power Dragonites, as they are still elite attackers, even with their nerf.

I'm doing the same. I want two maxed T-Tar's with B/C and two maxed with B/SE. Also will have two Golem's with RT/SE maxed. Double bug Scizor's? Oh yes... want at least one of those maxed as well as my SC/SB Gengar.

I'm solely focusing on legendaries before Go Fest.