You'll have to be very lucky, since the chance of encountering a shiny Pokemon is 1/8192.
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Tentacool evolves into Tentacruel at level 30.
there isn't, it is just talking about luck.but there is more change of getting a shiny with common pokemon, like tentacool on sea, or the common first normal pokemon, like: rattata, sentret, zigzagoon and bidoof
to get a green tetacool you just look all over the place PS. when you find a wild Pokemon the chances of it being shiny are 1 in 1280. Hope i helped.
Tentacool evolves into Tentacruel at level 30.
Tentacool evolves on Lvl. 30 into Tentacruel.