Finally the fat Hulk, is it worthy to use one Fast TM AND at least one Charge TM on a level 20 89%IV with 15 attack Hariyama with double steel moves?
If you have a lot of TMs, sure why not
Less than 20 on both kinds of TMs.
Then wait, but if you decide to power it up then use them
I have my fighting team set up with Focus Blast Mewtwo, Machamp and one Hariyama, I have not decided whether I will power up this 2nd Hariyama and TM both of his moves to replace Mewtwo on my fighting team.