Should I TM a B/HP Lvl 39 Gary for B/C?

What about trying to max your B/SE or B/C Tyranitar? That is what I am doing right now in an attempt to improve my solo game against Zam, since T-tar is incredibly useful as a generalist and as a counter to future legendaries. I don't think TMing the Gary is the worst idea, but his Hydro Pump is monstrous, and B/C mostly wouldn't be useful outside of this one matchup.

Have you tried the B/HP Gyarados against Alakazam? At level 39, it might already do the trick as-is. IMO the Psycho Cut movesets are totally doable. Confusion, not so much.

Do you have access to Houndoom? He is another good option for countering pure Psychic movesets.

I'd be hesitant to waste (use) a TM on a Gyrados and change a STAB move to a non-stab move...

Even though a dark move will be SE into Alakazam, you lose STAB so your gains are minimal..

Looking at a spreadsheet, you'd actually do LESS DPS going from HP -> Crunch so it's probably a very very bad idea to do this...

As has been mentioned on this site before, Gary was great to sit high in gyms, but he doesn't really have any real advantage compared to an ideal counter and with SE being 1.4, most generalists are worst off currently...I think someone calculated that a Level 20 Machamp does more DPS than a level 40 Dragonite against Tyranitar...

Gyarados also doesn't resist Psychic moves...even though he resists FB, any dark type will resist 2 out of the 3 charge moves and all darks are immune to psychic 0.51x (the quick move)...so that's probably a bigger factor in most fights.

I'd work on getting any high level, random Gengar, Pinsir, Houndoom, even Zam with Shadow Ball if you have it and use that instead of Gary...(to save on dust)...Gengar is probably the best bet, but is, of course, hard to use since you're taking SE damage as well...Scizor also doesn't seem to do as much damage as expected just due to the sheer (not top tier) power of FC/XS.

Just guessing, but I'd swap the Dragonites since they probably aren't doing as much DPS as a random level 30 Houndoom or Gengar, Pinsir, etc...

Will have to run simulations in Pokebattler to confirm...

I think turning a DT/C Gyarados into B/C is arguably useful. You use a fast TM (worth less than a charge TM) to guarantee yourself double dark, which is useful in the current meta if you don't have better alternatives (TTar B/C, Houndoom S/FP).

TM'ing B/HP is another matter. HP is Gyarados' best charge move and it has STAB. Also, you'd be spending a more valuable charge TM and only have a 50/50 shot at getting Crunch.

In other words, I'd consider the DT/C one but not the B/HP one if looking for a dark attacker.

I have similar gary in moveset and lv
Dont know about alakazam havent meet yet
But i do like it more than my slightly lower gary with B/C when i soloed Gengar
For me, gary B/HP is easier to use the B/C due to cooldown every time i used Crunch.
Yes HP also has long cool down, but because it is one bar it is not as bad atleast for me..
So if it is me, i keep my B/HP, but i already have gary with B/C so our situation is different