No. The unofficial Update 14 changes moves, abilities, and Pokémon data, causing desyncs. A modified game will only communicate with other copies running the same patch.
: The update included internal adjustments to the "web exploit injection" that previously allowed players to inject unauthorized Pokémon data into their saves. Essential Online Features Restored pokemon omega ruby update 14 updated
Once installed, the version number "1.4" will be displayed on the lower-right corner of the game's title screen. Note on Online Services: and Pokémon data