Thread:Gokyr586/@comment-1851310-20160327235616/@comment-11479355-20160328100443

As far as we know from toy reviews of the DX Eyecon Driver G, the Mega Omega Formation can only be performed when all of the 15 Parka Ghosts are summoned. In Ghost 23, Ghost is seen flicking the switch 15 times and summoned all the 15 Parka Ghosts before performing the finisher, hence it is implied to be the Mega Omega Formation finisher despite the different sound played. Furthermore, when that episode aired, TV-Asahi site lists the finisher as Omega Formation -- giving further confirmation that it is indeed a (Mega) Omega Formation finisher; Mega being becuase he summoned all 15.

Moving on to Zyuohger 7 where Ghost Grateful and Zyuoh Gorilla perform their finishers. We see both of them running, Ghost pressing the side button and immediately leaping afterward. He didn't flick the switch 15 times to summon the Ghosts, he merely pressed the side button. That logically would activate just the Grateful Omega Drive finisher, but then lo and behold, the Parka Ghosts suddenly appear behind him and he ends up doing the same finisher in episode 23. We already know he did the Mega Omega Formation finisher in episode 23, so this means he did the same thing again in Zyuohger 7 and the guys in post-production goofed up twice somehow.

Both Kamen Rider Storm Heroes and Kamen Rider: Battride War Genesis show Ghost Grateful doing another kind of finisher which involves him flying through the Eyecon Symbols and doing a kick. The profile card for 4-star Ghost Grateful in Storm Heroes as seen in this picture here states that Ghost Grateful's Storm Skill finishing move is called Grateful Omega Drive (グレイトフル オメガドライブ).

So there we have it sorted out. Grateful Omega Drive is the flying-through-Eyecon-symbols kick, and Mega Omega Formation is the Parka-Ghosts-combining-into-a-giant-ball kick.