Quoting myself from few threads ago for convenience.
DON'T create a new base 60 move to replace Ancient Power. Create a new base 90 move to replace it instead!!
This way the move will still function the same way as Technician'd Ancient Power (without the damn side effect) AND it will function on a second ability as well. Most likely Levitate.
Note - I voted for Levitate because it should be it's primary ability, with Technician as the Secondary ability (or other ability should it make miraculous come back)
Technician - would be an awesome ability. Remedying the low base power of Ancient Power, allowing for base 90 Hidden powers and maybe a small collection of lesser uses moves like, Shockwave, Dragonbreath, Silver Wind, Giga Drain ect.. The biggest problem with this though, that I feel has been over looked, is in fact Ancient Power's 10% stat up boost.
A boost in Speed means that no OU pokemon (bar Ninjask and Deoxys S) can out speed it even with a Choice Scarf. 50% extra power attached to base 120 Sp.att, that will likely already have STABed Ancient Power, Earth Power and a base 90 Hidden Power (wow that's a lot of "powers" lol) at least for type coverage. And with the extra boost in Defenses along with 90 base HP, not even things like Bullet Punch, Mach Punch or Vaccuum wave will take it down any more. It'll sweep entire teams just on that. No other user of AncientPower, OminousWind or Silver Wind can boast that. That is too much of a good thing, seriously...
DON'T create a new base 60 move to replace Ancient Power. Create a new base 90 move to replace it instead!!
This way the move will still function the same way as Technician'd Ancient Power (without the damn side effect) AND it will function on a second ability as well. Most likely Levitate.
Once again quoting myself.1st: Levitate
2nd: Technician (this is assuming a new move is granted and ancient power is not actually in his move pool)
These two I feel can complement each other in a trade for switch in ability for power play. With Levitate, grant it moves like Lava Plume, Energy Ball, Signal Beam, Discharge, Shadow Ball, Extrasensory and Flash Cannon (all move with base 80 or less) to work with. While Technician can grant a plethora of Base 90 moves, often with added effects.
Basically,
Levitate - Less power more switch in capability.
Technician - More power/move flexibility, less switch in opportunity,
Note - I voted for Levitate because it should be it's primary ability, with Technician as the Secondary ability (or other ability should it make miraculous come back)