Routeplanning should be this:
(normal mode)
intro, Take the test, find giro, Area D, Hivolt, Fistleo, Hurricaune, Prometheus, Luarle, Leganchor, Purprill, Protectos ~finals
(easy mode)
intro, test, giro, D, Hivolt, Purprill, Protectos, Fistleo, Prometheus, Hurricaune, Flammarl, Luarle, Leganchor ~finals.
On normal, you can rape some midbosses horribly by using the Ground Break(LV2 +down charge of FX), but in TAS maybe OIS wiggling can outperform it...I killed the big Mettool in two GB's and I killed the midboss in Area F in ONE ^^
As for Tactical Finish, HX needs both LV4, as in the final stage you have to use it on 6 bosses!!!
(flammarl,fistleo,protectos,purprill,serpent1&2)
FX needs two LV2 victorys, PX needs LV1s and LX needs about...I dunno, I always get two LV4 on them >.> or sometimes a LV3 on Luarle, practially
you can LV2 them both tho.
The normal route setup is made primarily to enable you to get the HX's OIS Tornado asap, and to make sure you can take the shortcut in area I, since it saves alot of time.
On Easy, you only really need the RollingSlash and PX's LV1 Chargeshot...
Something I discovered that may be useful, is that you can hit the airplane boss by shooting the Double Charge Shot at a wierd angle, the pink stuff around the charge shot will deflect and if done properly it connects, enabling you to take him down in 3 turns instead of 4!
Also, for a TAS, I think it may be better to use Aile, since there might be some use to her hitback (bounces more off enemies than Vent) and she actually crawls faster.
I saw some great bossvids on Youtube from AnLZero, they might help since they're superfast but they're LV4 only, so you should keep in mind to tweak strategies into hurting the bosses weakspots.
When I get mah new camera (and a DS with an L button that I didn't break), I'll try to make some recordings to help, it'll be shakking all over the place since I can't hold the damn thing still tho.
I actually broke two DS L buttons and two DS Lite L buttons during my speedrunning of ZX(and a little ZXA), these things are weak XD