Delta Kabuto/Kabutops - Type: Steel/Bug, Appearance: Kabuto + Genesect (High-Speed Flight Form) and Kabutops + Genesect (Normal Form), Ability: Hard Drive (uses Genesect's Drives to add dual typing [like Flying Press] to all moves, does nothing if not equipped with a drive)
Inspiration: Given that Kabutops and Genesect have similar body shapes and come from a similar time (300 million years ago), fans speculate that Genesect is a Cyborg Kabutops, so having the Delta be based on Genesect would be fitting.
Delta Omanyte/Omastar - Type: Normal, Appearance: Omanyte/Omastar + Arceus, Ability: Multitype (Arceus signature ability)
Inspiration: All Hail the Helix Fossil
Delta Aerodactyl - Type: Ghost/Poison? (still not sure), Appearance: Demonic Aerodactyl, Ability: Gluttony, Signature move: Hunger Strike (Strong Ghost-type version of Pluck or Bug Bite), Mega Delta Aerodactyl - Ability: Apocalypse/Final Countdown (applies the effect of Perish Song to all opposing pokemon, but opposing pokemon can not be trapped in battle [shadow tag, mean look, block, etc])
Inspiration: There was a popular fan-made hack of Pokemon Ruby called Pokemon Snakewood, which involved a zombie invasion made by the Four Horsemen of the Apocalypse in the Hoenn region. I won't go too in depth, but all you need to know is that one of the Four Horsemen, Famine, summons a demon, which is a shiny Aerodactyl, to stop the player. So, a hunger demon Aerodactyl would be pretty cool and a very good reference to this game. (Also, there are a number of fakemon in this game that are basically zombified versions of existing pokemon which could make excellent Deltas)