Parents: Gengar + Spiritomb
Shared Egg Group: Amorphous
Offspring Name: Gentomb
New Type: Poison/Dark
New Base Stats: 65/88/94/121/101/82
New Ability and Description: Levitate + Pressure = Exertion (This Pokemon is immune to Ground-type moves, and all Ground moves used on it use 2 PP)
Notable Moves: Shadow Ball, Dark Pulse, Sludge Bomb, Confuse Ray, Clear Smog, Shadow Sneak, Dazzling Gleam, Destiny Bond, Giga Drain, Hex, Will-O-Wisp, Mean Look, Perish Song, Memento, Pain Split, Taunt, Thunderbolt, Water Pulse, Energy Ball.
Role identification: A Ground-Types's worst nightmare. Gentomb not only penalizes them, but can hit them hard with Giga Drain and Water Pulse. The deadly Will-O-Wisp/Hex combo hurts like the dickens, too. Add decent type coverage, and you have a pretty good tank.
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Parents: Dunsparce + Swoobat
Shared egg group: Field
Offspring name: Swooparce
New type: Normal/Psychic
New base stats: 93/73/72/81/70/89
New ability and desc: Unaware + Serene Grace = Blissful Ignorance (Ignores positive stat changes of the opponent and doubles the chance of the user's move's secondary effects occurring)
Notable moves: Ancient Power, Zen Headbutt, Air Slash, Calm Mind, Giga Drain, Heat Wave, Psychic, Roost, Shadow Ball, Stored Power, Super Fang, U-Turn, Body Slam, Glare, Blizzard, Hex, Iron Tail, Poison Jab, Thunder, Coil.
Role identification: Swooparce may look pathetic, but the combination of Blissful Ignorance and a massive movepool gives it a couple of uses. Ancient Power's 20% chance of boosting all stats isn't too bad, and combined with Stored Power, it can become pretty annoying pretty quickly. Air Slash and Glare make a paraflinch combo, and Calm Mind/Coil can make it bulkier and aid Stored Power. Using Coil to increase the accuracy of Thunder, Iron Tail, and the like gives Swooparce more chances to cripple the opponent. All in all, it's threatening if it sets up, but otherwise, you don't need to worry about it much.
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Parents: Pelipper + Ludicolo
Shared egg group: Water 1
Offspring name: Pelicolo
New type: Grass/Water
New base stats: 80/70/95/97/95/77
New ability and desc: Keen Eye + Swift Swim = Telescope (This Pokemon's moves can't miss in rain)
Notable moves: Leech Seed, Aqua Ring, Air Slash, Blizzard, Scald, Hydro Pump, Gunk Shot(?), Rain Dance, Hurricane, Roost, Giga Drain, Fake Out, Focus Blast, Hyper Voice, Teeter Dance.
Role identification: Decent bulk, nice typing, AND an ability that fits its movepool? Nice. Very nice. Granted, Hurricane had 100% accuracy in rain anyways, but hey, at least you won't get those annoying Leech Seed misses. Blizzard, Hydro Pump, and Focus Blast benefit, too, as well as Gunk Shot, but since that's a physical move, I doubt that it'd see much use. Roost, Aqua Ring, Leech Seed, and Giga Drain give Pelicolo reliable recovery, and if you tack on a Leftovers with that? Dear god, that sounds annoying.
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Parents: Wobbuffet + Gardevoir
Shared egg group: Amorphous
Offspring name: Wobugarde
New type: Psychic/Fairy
New base stats: 139/59/71/89/96/66
New ability and desc: Trace + Shadow Tag = Recollection (Traces the ability of the opponent's previous Pokemon; fails if the Pokemon they're using is the only one they've sent out)
Notable moves: Charm, Mirror Coat, Counter, Encore, Tickle, Safeguard, Destiny Bond, Moonblast, Draining Kiss, Calm Mind, Energy Ball, Focus Blast, Grass Knot, Healing Wish, Hyper Voice, Light Screen, Reflect, Memento, Psychic, Hypnosis, Dream Eater, Nightmare, Shadow Ball, Stored Power, Taunt, Torment, Thunder Wave, Thunderbolt, Will-O-Wisp, Wish.
Role identification: While fusing ANYTHING with Wobbuffet seems like a bad idea, Wobugarde does have a few uses if you can work with its ability. Yes, it's a very situational ability, but just imagine if you get a hold of Prankster or one of Prankster's fusion abilities with it. Wobugarde's support movepool is diverse, having both screens, access to both Memento and Healing Wish, Charm and Tickle to weaken opponents, and best of all: WISH. Coming off of a massive HP stat, a Wish from this puppy could be better than a Recover. Its Sp. Atk isn't too awful either, and access to Calm Mind makes it even bulkier while allowing it to hit harder. This may be a weird fusion, but I like it all the same. But I know what you came here to see, so I'll just deliver now.
Parents: Wobbuffet + Gardevoir
Shared egg group: Amorphous
Offspring name: Mega Wobugarde
New type: Psychic/Fairy
New base stats: 139/79/71/129/116/86
New ability and desc: Pixilate
Notable moves: Same as above
Role identification: All of Mega Wobugarde's stats, barring HP, may be only slightly better than a regular Gardevoir's, but DAT HEALTH DOE. Pixilate Hyper Voice still stings here, and Calm Mind makes this guy nearly impossible for a special attacker to deal with. And hey, if you've hit your faster enemies with a Thunder Wave, you're more than likely to outspeed them and use Destiny Bond if Mega Wobugarde isn't long for the battlefield.
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Parents: Scrafty + Furfrou
Shared egg group: Field
Offspring name: Fufty
New type: Normal/Fighting
New base stats: 80/95/97/65/112/90
New ability and desc: Fur Coat + Shed Skin = Disrobe (Pokemon with this ability lose any status condition they have at the end of the turn. If holding a Toxic/Flame Orb, the condition returns the instant it disappears)
Notable moves: Bulk Up, High Jump Kick, Crunch, Dragon Dance, Fake Out, Fire Punch, Foul Play, Head Smash, Drain Punch, Outrage, Ice Punch, Cotton Guard, Iron Head, Poison Jab, Stone Edge, Thunder Punch, Facade, Sucker Punch, U-Turn, Wild Charge, Zen Headbutt, Thunder Wave.
Role identification: One of the best Facade users you could ask for, and practically immune to Toxic Spikes. Fufty's access to Bulk Up and Dragon Dance let it become a threatening tank or sweeper, depending on your preference. The moves I mentioned above cover a great deal, with 12 different types to choose from. U-Turn is always nice, and Poison Jab/Iron Head takes care of those pesky Fairys. You may not have the defense buff of Fur Coat anymore, but that doesn't makes Fufty any less of a threat.
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Remember this guy?
Parents: Zweilous + Arbok
Shared egg group: Dragon
Offspring name: Arilous
New type: Dragon/Poison
New base stats: 76/95/80/75/85/79
New ability and desc: Hustle + Intimidate = Rampage (Effects of both abilities combined)
Notable moves: Outrage, Coil, Gunk Shot, Crunch, Aqua Tail, Fire Fang, Thunder Fang, Ice Fang, Head Smash, Return, Superpower, Body Slam, Earthquake, Iron Tail, Poison Fang, Pursuit, Seed Bomb, Sucker Punch.
Role identification: Zweilous has the strongest Outrage in the game thanks to STAB, Hustle, and a base 85 Attack stat. Now imagine that with a stronger Attack stat and Coil. You have just pictured a monster. This also most likely gives Arilous the strongest Gunk Shot, which is also extremely destructive. The Intimidate effect is very nice, giving Arilous an edge on physical opponents. Sucker Punch does a truckload of damage as well, and access to all the fangs takes out the majority of weaknesses Arilous has. Poison Fang's base 50 damage is boosted by the same combination that makes Outrage and Gunk Shot so scary, and a 50% chance to badly poison the opponent makes this forgotten fang more viable than it ever has been. If this thing gets off just one Coil, it becomes a beastly tank. Alas, it isn't perfect. But hey, no Pokemon is.