If you wanna tame this guy on it's back make sure you have a tek sword or sword with at least 500 attack % and a lot of melee upgrades as in full melee but put in a lot of hp or your dead. Use the lightning to get the corruption out then hit it with the sword it's a 1 hit destroy corruption trust me I have done it
How to tame a titan:
Step one: piss your pants
Step two: grab a mek
Step three: shoot the glowy thingnies
Step four: piss your pants some more
Step five: destroy all of the glowing orbs until it falls down.
Step six: click tame kaiju
Boom you have a titan
Pro tip: Don't use explosive weaponry and really bad rexes with no saddles like the devs did. Fab Snipers for taming it with little/no collateral damage, actually decent rexes + imprint + saddles to kill it (Probably not for this flying one tho lmao).