What are all Pokémon you can't trade on the GTS in OR/AS?

Question

I know a few like Cosplay Pikachu, Groudon and Kyogre

Comments

All event Pokémon unless hacked. Also, Rayquaza, Kyogre and Groudon caught in ORAS. Know this by experience, and boy, is it frustrating.

Answer 1

Any Hacked Pokemon, Hacked Events, Shiny Hacked events, Underleveled Pokemon, such as a Level 1 Gengar, even though Level 1 Haunter can be traded on GTS. Any Pokemon holding a Mega Stone cannot be traded/ Deposited on GTS, nor can any Pokemon with HM's in your Party. True (Not Generated) Events cannot be traded on the GTS. Alternate formed Pokemon, such as a Mega Pokemon that is defauted in its Mega Form (You can do this through hacking) cannot be traded at all. Black/White Kyurems cannot be traded at all either.

I feel that I'm missing some Pokemon... Hacked Arceuses without Plate of Sprite type can be traded on GTS...

EDIT #1: Any Pokemon Holding MEga Stones, BW items, Not Gen 6 Poke Balls (Such as Holding a cherish ball) and Mega Stones introduced in ORAS (Such as galladite)

Comments

What about Kyogre Groudon Rayquaza Lugia etc. caught in ORAS?

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Ammeter they Can be traded unless they are holding an item introduced in ORAS.