Mewtwo attacker squad
Tyranitar
1: CP 3013 IV91 (A15) L29 B/SE
2: CP 2274 IV93 (A15) L22 B/SE
3: CP 2124 IV89 (A15) L20.5 B/SE
Gyarados
4: CP 2776 IV91 (A13) L30 B/Cr
5: CP 2490 IV87 (A14) L27 B/HP
6: CP 2950 IV96 (A14) L29 DT/O
7: CP 2926 IV77 (A10) L29.5 DB/DC
8: CP 3050 IV82 (A12) L31 DB/H
9: CP 3043 IV93 (A14) L30 DT/H
10: CP 2313 IV84 (A15) L23 DT/H
Snorlax
11: CP 2875 IV60 (A7) L34 L/BS
12: CP 2298 IV64 (A13) L25 L/HB
13: CP 2290 IV42 (A0) L26 L/HB
Unconventional options:
Alakazam
CP 2416 IV84 (A13) L30 PC/SB
Typhlosion
CP 1897 IV91 (A15) L25 SC/OH
Which ones should I power up and/or TM?
Answers
Earlier a thread discussed how easy Entei is to beat, three at level 30-35...Mewtwo is easier according to my eyeballs looking at Pokebattler. About 700 seconds to win vs Mewtwo for 1 person using all level 30 Tyranitars. Best counter for Entei looks to be SE Golem closer to 800 seconds...That tells me to have Tyranitar(s) and/or B/C Gary, let the Snorlaxes float as they are
Useable 6/8ths of the time. Don't change your other ones to crunch, but all numbers indicate it is slightly better than SE. Level 20 better than a Snorlax, although almost all cases you can anchor your biggest lax. I truly think battle won't go that long but even Gyarados is iffy vs Confusion.***only concern I see with a level 20 Tyranitar is with Focus Blast and to a lesser extent Shadowball, to be extra safe against ShB two Snorlaxes like you already have them could be a viable option