I've contemplated doing all of the Pokemon, but I've since given up. However, one creature survived the disillusionment...
(Note: these are poke-stats for those who aren't too fond of Pokemon)
Demon, Pikachu (Tanar’ri)
Tiny Outsider (Chaotic, Evil)
Hit Dice: 8d8+24 (60 hp)
Initiative: +5 (+5 Dex)
Speed: 90ft, climb 10ft
AC: 27 (+2 size, +5 Dex, +10 natural)
Attacks: Slam +15 melee
Damage: Slam 1d6+2
Face/Reach: 2.5ft by 2.5 ft/ 0ft
Special Attacks: Aura of cute, resist capture, spell like abilities, summon tanar’ri
Special Qualities: Damage reduction 30/+2, SR 20, tanar’ri qualities (see page 43 of the Monster Manual)
Saves: Fort +9, Ref +13, Will +11
Abilities: Str 12, Dex 21, Con 16, Int 20, Wis 20, Cha 23
Skills: Bluff +19, Concentration +16, Hide +18, Knowledge (military) +18, Intimidate +19, Listen +18, Search +18, Spot +18
Feats: Deflect Arrows, Dodge, Lightning Reflexes, Weapon Finesse (slam)
Climate/Terrain: Any land or underground (The Abyss)
Organization: Solitary
Challenge Rating: 11
Treasure: Standard
Alignment: Always chaotic evil
Advancement: 9-12 HD (Tiny), 13-16 HD (Small)
“Aw, how cute!” Many adventurers during their first (and last) encounter with a pikachu.
Pikachus are horribly evil demons in the guise of an adorable rodent.
A pikachu appears to be a slightly anthropomorphic rodent, about 1 foot in height with yellow fur, large, soulful eyes and a lightning bolt-shaped tail. In fact, pikachus (which is a rough translation of Japanese for “gleaming mouse”) are one of the most hateful and sadistic creatures in the multiverse, with a taste for sarcasm, domination and torture. Oddly, although they communicate telepathically, they accompany their messages with vocalization, in the form of their name and it’s component syllables (sample dialogue: “Pika pi pi, pika, pikachu” for “To be or not to be, that is the question.”) Pikachus are brilliant tacticians, and rival mariliths as the best generals of demon armies. With the need for more leaders increasing as the Blood War rages futilely, pikachus are becoming more common on the battlefields.
Combat
Pikachus prefer to let their minions and dretch armies fight for them; if caught alone (on a reconnaissance mission, for example) they fight with their spell-like abilities, especially their lightning bolts. Unlike other demons, they have no qualms about summoning other tanar’ri.
Aura of Cute (Su): All creature coming within 10 feet of a pikachu must make a Will save (DC 22) or be under the effect of a dominate monster spell. They can suppress this ability at will. This aura can be dispelled, but the pikachu can raise it again as a free action.
Spell-like Abilities: At will-bestow curse, chaos hammer, deeper darkness, desecrate, detect good, detect law, inflict critical wounds, lightning bolt and unholy blight. 1/day- chain lightning, word of chaos. All abilities are as the spells cast by an 8th level sorcerer (DC 16 + spell level)
Resist Capture (Ex): Pikachus are unnaturally quick beings, and this combines with their resistances to make them difficult to catch. They cannot be caught in a net or a tanglefoot bag. They are immune to webs, natural and magical. They are immune to hold monster, although a specially crafted spell might work.
Summon Tanar’ri (Sp): Once per day, a pikachu can summon 4d10 dretches with a 75% chance of success or one pikachu with a 20% of success.
Feats: A pikachu receives Deflect Arrows as a bonus feat, even though it doesn’t have all of the prerequisites.
Demiurge out.