Stage 1: Spinette
Type: Rock/Water
Classification: River Hunter Pokémon
Height/Weight: 0.8 m / 15 kg
Abilities: Swift Swim / Hidden: Sturdy
Sail: Small triangular sail (rounded at the top) starting to emerge; light gray with faint blue streaks along the spine.
Arms: Slightly longer than normal for its size; thin but with defined muscle for future growth. Tiny sharp claws.
Head & Teeth: Narrow snout, tiny sharp teeth for fish-snatching. Eyes keen, dark amber.
Body Texture: Smooth, lightly scaled; small rocky nodules forming on forearms and tail base, resembling pebbles.
Tail: Short, slightly flattened at the tip for swimming.
Stage 2: Spinarock
Type: Rock/Water
Classification: River Predator Pokémon
Height/Weight: 2 m / 120 kg
Abilities: Swift Swim / Hidden: Rock Head
Sail: Larger, taller; streaked with darker blues and gray. Slight serration along the top edge.
Arms: Noticeably elongated and muscular; three-fingered hands with a small developing thumb; long curved claws. Slight rock-like ridges along forearms.
Head & Teeth: Jaw elongated, interlocking teeth beginning to appear. Eyes slit-shaped, amber with a hint of cunning intelligence.
Body Texture: Semi-rough scales that still look like rocks; irregular rock-like patches on back, shoulders, and forearms.
Tail: Strong, muscular, slightly flattened side-to-side for swimming.
Stage 3: Spinosurge
Type: Rock/Water
Classification: Apex River Pokémon
Height/Weight: 5 m / 500 kg
Abilities: Swift Swim / Hidden: Solid Rock
Sail: Massive, fully developed; serrated, slightly curved backward. Deep navy-blue with black accents; used for intimidation and mate attraction.
Arms: Extremely long and powerful; fully muscular. Forearms armored with rock-like plating and ridges; claws sharp and dangerous. Fully opposable thumbs on each hand.
Head & Teeth: Huge elongated snout with interlocking teeth. Jaw strong enough to drag large prey into water. Eyes intelligent, amber with piercing black pupils.
Body Texture: Heavily armored with rocky ridges along spine, shoulders, and arms; semi-aquatic streamlined form. Camouflage aids ambush hunting.
Tail: Thick, muscular, flattened fin-like tip for powerful swimming strikes.
Posture: Semi-aquatic crouch; stance balanced but ready to lunge.
Signature Move: Tide Slam – Rock/Water move; heavy damage, inflicts 50% of damage dealt as recoil.