Might as well try something:
Hitmonlee
Fighting-->Fighting/Dark
Limber/ Reckless/ Unburden-->Defiant
50/120/53/35/110/87------>50/160(+40)/63(+10)/35/120(+10)/127(+40)
Hitmonlee is supposed to be the stronger and faster than his brothers, Dark type is there because I get an eery feeling, also Dark type is the most all-out offensive typing I can thinking of, Defiant makes him very scary but he still doesn't get the ability before mega evolving, plus his weak to most defog users.
Some calcs:
+2 252 Atk Hitmonlee Stone Edge vs. 252 HP / 252+ Def Mandibuzz: 354-418 (83.4 - 98.5%) -- guaranteed 2HKO after Leftovers recovery
+2 252 Atk Hitmonlee Sucker Punch vs. 252 HP / 252+ Def Mega Venusaur: 190-225 (52.1 - 61.8%) -- guaranteed 2HKO
+2 252 Atk Hitmonlee Stone Edge vs. 252 HP / 252+ Def Shuckle: 196-232 (80.3 - 95%) -- guaranteed 2HKO after Leftovers recovery
+2 252 Atk Hitmonlee High Jump Kick vs. 252 HP / 232+ Def Skarmory: 285-336 (85.3 - 100.5%) -- 6.3% chance to OHKO
Electrode
Electric-->Electric/Dark
Soundproof/Static/Aftermath-->Darkate
60/50/70/80/80/140-->60/90(+40)/90(+20)/90(+10)/90(+10)/160(+20)
+Boomburst, Dark pulse and Flash cannon
I unlike most people always thought of mega Electrode as ultraball backwards instead of a masterball so I decided to give him a dark typing plus its smile creeps me off so much, I had the idea of buffing its attack to offset the great ability of Darkeate, even then it remains like deoxys 2.0 without the entry hazard but with a better offensive typing even if its boosting moves are nowhere to be found and special movepoll is also short, yeat it has darkeate boomburst which makes it a deadly powerhouse to deal with:
252+ SpA Electrode Boomburst vs. 252 HP / 252+ SpD Rotom-W: 174-205 (57.2 - 67.4%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Electrode Boomburst vs. 252 HP / 252+ SpD Deoxys-D: 260-308 (85.5 - 101.3%) -- 6.3% chance to OHKO
Strong, but:
252+ SpA Electrode Boomburst vs. 252 HP / 252+ SpD Shuckle: 99-117 (40.5 - 47.9%) -- guaranteed 3HKO after Leftovers recovery
252+ SpA Electrode Boomburst vs. 252 HP / 4 SpD Blissey: 195-231 (27.3 - 32.3%) -- 59.1% chance to 4HKO after Leftovers recovery
(195, 198, 199, 202, 205, 207, 210, 211, 214, 216, 219, 220, 223, 225, 228, 231)
See Boomburst while strong isn't gamebreaking plus he still has its other STAB, Thunderbolt, which isn't boosted at all plus no boosting moves
Cloyster
Water/Ice-->Water/Grass
Shell Armor/Skill Link/Overcoat-->Hydration
50/95/180/85/45/70---->50/125(+30)/205(+25)/100(+15)/85(+40)/60(-10)
+Leech Seed, Bullet Seed and Spiky Shield
So the concept revolves around the fact that its shell gets covered in algae and other kinds of sea moss things, spiky shield is there because it has spikes all over the body, bullet seed because grass stab and leech seed is normal to grass types I really have not much to say except it's tanky and fun fact it has the same special defense as in gen 1.
Marowak (X)
Ground-->Ground/Steel
Rock Head/Lightning Rod/Battle Armor-->Huge Power
60/80/110/50/80/45-->60/100(+20)/130(+20)/60(+10)/90(+10)/85(+40)
+Earth Power, Shadow Claw and Shadow Ball
Marowak becames a faster stronger powerhouse, with access to good bulk, it may be op, it really looks like it, but I'm kind of bias towards this guy/girl, even so I tried to make him as balanced as possible while retaining him something Gamefreak would do, Steel typing is there because I can't stop thinking of him with a giant steel bone.Random calcs:
252 Atk Huge Power Marowak Iron Head vs. 252 HP / 252+ Def Shuckle: 168-200 (68.8 - 81.9%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Huge Power Marowak Stone Edge vs. 252 HP / 252+ Def Mandibuzz: 254-300 (59.9 - 70.7%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Huge Power Marowak Bonemerang (2 hits) vs. 252 HP / 252+ Def Forretress: 156-186 (44 - 52.5%) -- guaranteed 3HKO after Leftovers recovery
Marowak (Y)
Ground-->Ground/Ghost
Rock Head/Lightning Rod/Battle Armor-->Parental Bond
60/80/110/50/80/45-->60/80/130(+20)/110(+50)/110(+30)/45
+Earth Power, Shadow Claw and Shadow Ball
This Marowak gets a different approach, its supposed to be a tribal shaman Marowak with feathers and tribal paint. He attacks with a floating skull, which represents the spirit of its dead mother, if you don't understand the concept, they attack together, because it's a shaman it's more specially orientated, even if it still keeps the amazing defense.Random Calcs:
252+ SpA Parental Bond Marowak Earth Power vs. 252 HP / 4 SpD Blissey: 166-198 (23.2 - 27.7%) -- possible 5HKO after Leftovers recovery
252+ SpA Parental Bond Marowak Ice Beam vs. 252 HP / 0 SpD Mandibuzz: 303-357 (71.4 - 84.1%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Parental Bond Marowak Shadow Ball vs. 252 HP / 252+ SpD Rotom-W: 132-157 (43.4 - 51.6%) -- guaranteed 3HKO after Leftovers recovery
See not uber broke unlike mega x, I mean while it does a completely different job it still is kind of outclassed by X in setting up, while being better at simple offense
Edit: Fixed, thanks Arikado!