Tentacool in depth
Menokurage: jellyfish eyes
The Japanese メノクラゲ combines 目の (me no, “of the eye”) with クラゲ (kurage, “jellyfish”), pointing directly to the one thing that sets it apart from an ordinary jellyfish: the two red crystals on its head. The English Tentacool is lazier, a play on tentacle and cool, and that ending carries through the whole line to the cruel in its evolution.
The biological basis is simply a cnidarian with no extra frills. Almost transparent body, rounded bell, stinging tentacles, movement by current rather than muscle. The series’ contribution is optical: turning its internal water into a lens and the frontal crystal into the cannon. It’s one of the few Generation I creatures whose ranged attack has a mechanical explanation written directly into the Pokédex.
What it was left with after Gold and Silver’s stat split
In Red and Blue, it worked with a single Special stat of 100, which served both to deal and take damage. Its Bubble Beam hurt as much as it could withstand an opponent’s Psybeam. When Gold and Silver split that stat in two, the defensive half kept the full 100 and the offensive half sank to 50.
Few species came out of that overhaul worse off. It went from a reasonable special attacker to a special wall with its hands tied, and the problem was never fixed: the figures are still exactly the same today. That’s the direct reason its movepool feels wasted. It gets Hydro Pump at level 48, Sludge Wave at 44, Sludge Bomb and Ice Beam by TM, and none of the four really hits because the multiplier behind them simply isn’t enough.
Its fellow dual-types, and why they come out ahead
Water and Poison is an unusual combination. Qwilfish has shared it since Generation II and fills the same Toxic Spikes-setting role with better physical Attack; Mareanie arrived in Generation VII, and its evolution turned that defensive pairing into something considerably sturdier. The one here retains the advantage of being older, and not much else.
The obvious answers are Electric- and Grass-types. Chinchou hits it super effectively with Electric-type moves and even resists the Water it can throw back, while any decent physical attacker finds a 35 Defense that simply doesn’t hold up. Just be careful about chaining draining moves: with Liquid Ooze active, a badly calculated Giga Drain heals the wrong side.
One odd detail: Swords Dance appears in its list of compatible TMs. With 40 Attack and Poison Jab at level 36 as its strongest physical move, it’s one of those compatibilities that exists on paper and that nobody has ever used seriously.