On Monday 3/15/2021, my 1000th Team Rocket battle was also the 300th heart I needed to earn ‘Best Buddy’ with my Shadow Mewtwo.
My Shadow Mewtwo currently has Psycho Cut / Ice Beam. When I have a spare 120,000 Stardust, I’ll unlock Psystrike.
Should also get my second Level 40 97% Metagross and first Level 22 97% Abomasnow and to ‘Best Buddy’ status today, too. Then to power-up the Abomasnow to Level 44.5 for Ultra League.