Sinnoh confirmed!... As the Gen 4 Starters will get their own Costumes. They may not keep their former type, but it's how they get better with a new role that counts.
Juggler Turtwig
Typing - Rock
Item - Construction Helm
Abilities - Magic Bounce | Skill Link
HP - 55
Atk - 78
Def - 59
SpA - 35
SpD - 60
Spe - 51
BST - 338
Juggler Grotle
Typing - Rock
Item - Construction Helm
Abilities - Magic Bounce | Skill Link
HP - 75
Atk - 99
Def - 70
SpA - 35
SpD - 70
Spe - 56
BST - 425
Juggler Torterra
Typing - Rock
Item - Construction Helm
Abilities - Magic Bounce | Skill Link
HP - 80
Atk - 119
Def - 85
SpA - 55
SpD - 85
Spe - 101
BST - 545
New Moves - Accelerock, Shell Smash, U-Turn, Rock Blast, Water Shuriken
Design - The Turtwig line's shell is a bit thinner, but they can also able to stand on with their hind feet because of their sturdier and larger arms, which now had fingers. They also gained a brown/white jester clothing.
Competitive - Torterra had learned plenty of Rock-type moves, so all he needs for this is Shell Smash for a good sweep, U-Turn for momentum, Rock Blast and Water Shuriken for good use of Skill Link, Juggler Torterra can use Sword Dance for a sweep, or Rock Polish to outspeed almost every threat, or Shell Smash for both but requires White Herb, lest it will be more frail, and had enough coverage (Ground against Steel, Grass against Water and Ground, and U-Turn for Grass) to make it difficult to deduce what Type would fit best. Magic Bounce to juggle Other Moves back at the foes (get it? Juggle?), and Skill Link for good use of Rock Blast, Bullet Seed and Water Shuriken.
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Acrobat Chimchar
Typing - Ground / Flying
Item - Tectonic Sand
Abilities - Hasty | Quick Claws
HP - 44
Atk - 63
Def - 39
SpA - 63
SpD - 39
Spe - 81
BST - 329
Acrobat Monferno
Typing - Ground / Flying
Item - Tectonic Sand
Abilities - Hasty | Quick Claws
HP - 59
Atk - 93
Def - 43
SpA - 93
SpD - 43
Spe - 94
BST - 425
Acrobat Infernape
Typing - Ground / Flying
Item - Tectonic Sand
Abilities - Hasty | Quick Claws
HP - 71
Atk - 109
Def - 79
SpA - 109
SpD - 79
Spe - 107
BST - 554
New Moves - Sky Attack, Fly, Earth Power, Air Slash, Clear Smog
Design - The Chimchar line had their flames turned into twirls of a tornado, and wears a sand-patterned vest that is similar to acrobats. Monferno and Infernape's white fur had turned into brown.
Competitive - Acrobat Infernape may be only marginally stronger than normal Infernape, but in addition of dangerous STAB Earthquake, Infernape had already got both Sword Dance and Nasty Plot, which means it can become a set up sweeper or even a wall breaker of either specialty. Hasty will give instant Sky Attack or the more accurate but less powerful Fly (or Solar Beam for coverage), or Quick Claws for toying with 70 or lower BP moves such as Flame Wheel, Bulldoze, Low Sweep, U-Turn, Clear Smog and more. Earth Power and Air Slash to ensure you get Special moves STAB, and you got Fire-type moves against Ice, and Grass-type (Grass Knot or Solar Beam) or Electric-type (Thunder Punch) against Water-type.
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TV Piplup
Typing - Electric / Ghost
Item - Telsa Coil
Abilities - Surge Surfer | No Guard
HP - 53
Atk - 41
Def - 48
SpA - 71
SpD - 56
Spe - 65
BST - 334
TV Prinplup
Typing - Electric / Ghost
Item - Telsa Coil
Abilities - Surge Surfer | No Guard
HP - 64
Atk - 56
Def - 68
SpA - 91
SpD - 67
Spe - 79
BST - 425
TV Empoleon
Typing - Electric / Ghost
Item - Telsa Coil
Abilities - Surge Surfer | No Guard
HP - 84
Atk - 71
Def - 81
SpA - 121
SpD - 91
Spe - 102
BST - 550
New Moves - Thunderbolt, Thunder, Shadow Ball, Nasty Plot, Focus Blast
Design - The Piplup line engages yellow plasma particles around it, with floating lightning traveling around them. They also had a tv stuck on their head, which gets more luxuriant as they evolve.
Competitive - TV Empoleon can either works as a fast sweeper under Electric Surge with Surge Surfer, or a sure hit wall breaker using Thunder and Focus Blast with No Guard. TV Empoleon had already got Water-type moves from its Pre-Costume form to defend itself against Ground-type threats, most notably Scald and Hydro Pump. While frail, it can break walls after a Nasty Plot boost.