Snivy

Snivy
Unovadex #001
Nationaldex #495
Type: Grass
Species: Grass Snake Pokémon
Ability: Overgrow/ Contrary (Hidden Ability)
Evolution: Servine (lv. 17) Serperior (lv. 36)
Exp. at lv. 100: 1,059,860
Height: 0.6m
Weight: 8.1kg
Catch Rate: 5.9% (Note: this Pokémon, at this time, is unavailable in the wild.)
Gender Ratio: 88% Male, 13% Female (Exact number: 87.5% Male, 12.5% Female)
Egg Group: Field/Grass
EVs Yielded: 1speed
Obtainable: Beginning of the game (Starter), Breeding, Event (Pokémon Center, now over, no more scheduled events at this time.)
Weaknesses: Fire (x2)
Flying (x2)
Poison (x2)
Bug (x2)
Ice (x2)
Moves:
Tackle: Base

Leer: Level 4
Vine Whip: Level 7
Wrap: Level 10
Growth: Level 13
Leaf Tornado: Level 16
Leech Seed: Level 19
Mega Drain: Level 22
Slam: Level 25
Leaf Blade: Level 28
Coil: Level 31
Giga Drain: Level 34
Wring Out: Level 37
Gastro Acid: Level 40
Leaf Storm: Level 43
Grass Pledge: Tutor (Driftveil City)
Strategy: My favourite moveset for Snivy is Leech Seed, Leaf Storm, Coil or Leaf Blade, Subsitute (TM only). Obviously you're going to want to evolve Snivy before you try any competitive battles, but keeping Snivy from evolving until later does let it learn moves faster. Snivy does have speed on its side, so only a few EVs should be invested in speed. I'd say put some in special attack because of Leaf Storm, but you may want to delete Coil for Leaf Blade, to avoid lowering your stats too much in battle.

Victini

Victini
Unovadex #000
Nationaldex #494
Type: Fire/Psychic
Species: Victory Pokémon
Ability: Victory Star (Raises allies' accuracy)
Exp. at lv. 100: 1,250,000
Height: 0.4m
Weight: 4.0kg
Catch Rate: 0.4%
Gender Ratio: Genderless
Egg Group: Undiscovered/None
EVs Yielded: 3hp
Obtainable: By Liberty Pass (Event Key Item) or through trade or an event. Not available in game.
Weaknesses: Ground (x2)
Water (x2)
Ghost (x2)
Rock (x2)
Dark (x2)
Moves:
Searing Shot: Base
Focus Energy: Base
Confusion: Base
Incinerate: Base
Quick Attack: Base
Endure: Level 9
Headbutt: Level 17
Flame Charge: Level 25
Reversal: Level 33
Flame Burst: Level 41
Zen Headbutt: Level 49
Inferno: Level 57
Double-Edge: Level 65
Flare Blitz: Level 73
Final Gambit: Level 81
Stored Power: Level 89
Overheat: Level 97
V-Create: Event Only
Fusion Flare: Event Only
Fusion Bolt: Event Only
Strategy: Obviously a good special attacker, Jolly or Adamant natures are probably the best. I suggest a Choice Scarf, or a Life Orb. Best moveset, in my opinion, is Final Gambit, Overheat, Searing Shot, and Psychic. Obviously going to want to invest some EVs in Special Attack, and maybe Speed. I also find a few EVs in Special Defense useful.