Unlikely that this hasn't been posted before but whatever.
Parents: Hydreigon/Salamence
Shared egg group: Dragon
Offspring name: Salavier
New type: Dragon/Dark
New base stats: 104/130/95/128/95/109
New ability and desc: Dragon's Wings (Intimidate + Levitate) - Immunity to Ground Type moves. Lowers foe's Attack one Stage.
Notable moves: Outrage, Dragon Dance, Dragon Rush, Dragon Claw, Dragon Tail, Draco Meteor, Dragon Pulse, Superpower, Focus Blast, Crunch, Taunt, Hone Claws, Stone Edge, Rock Slide, Head Smash, Earthquake, Earth Power, Iron Tail, Flash Cannon, Aqua Tail, Surf, Hydro Pump, Zen Headbutt, U-turn, Fire Blast, Hyper Voice, Refresh, Roar, Tailwind, Defog, Roost, Thunder Wave
Role identification: This Pokemon is meant to be an offensive beast with defensive utility. It's able to run an either bulky or fast spread with the ability to go physical, special, or mixed. An adept Choice user and a Deadly Dragon Dance Sweeper, Salavier can be a great late-game cleaner or wallbreaker. Salavier also has some decent utility options, carrying options such as roar, thunder wave, defog, taunt, reliable recovery in roost, and able to maintain momentum with u-turn, all the while carrying 6 resistances and 2 immunities. Usable on either offensive or balance teams.
Parents: Mimikyu/Gallade
Shared egg group: Amorphous
Offspring name: Gallentkyu
New type: Ghost/Fighting
New base stats: 72/118/83/68/120/98
New ability and desc: Knight's Shield (Justified+Disguise) - The first hit this pokemon takes in battle deals 0 neutral damage. When the shield is broken, this pokemon's attack is increased by one stage.
Notable moves: Wood Hammer, Leaf Blade, Play Rough, Leech Life, Shadow Claw, Shadow Sneak, Low Kick, Close Combat, Earthquake, Stone Edge, Rock Slide, Elemental Punches, Drain Punch, Swords Dance, Knock Off, Bulk Up, Will 'o Wisp, Thunder Wave, Hypnosis, Encore
Role identification: A simple physical set up sweeper. One Swords Dance after taking a hit will result in +3 allowing it to punch holes in the opppnents team. Its great attacking options include STABs in Close Combat, Low Kick, Drain Punch, Shadow Claw, and Shadow Sneak, and coverage options like EQ, Stone Edge, the elemental punches, and Knock Off. Status moves such as thunder wave, encore, and hypnosis help to ease set-up.
Parents: Mimikyu/Gallade-Mega
Shared egg group: Amorphous
Offspring name: Gallentkyu-Mega
New type: Ghost/Fighting
New base stats: 72/158/113/68/120/128 (+40 Attack, +30 Defense, +30 Speed)
New ability and desc: Inner Focus - This pokemon cannot be made to flinch
Notable moves: See above
Role identification: After setting up pre-mega until you shield is broken, mega evolve and procede to sweep the crap out of anything that stands in your way. With the same amazing completely unresisted stab combo and new-found bulk, power, and speed, Gallentkyu is now able to punch holes in the opponents team and clean mid to late game.