Linoone doesn't evolve. It's the final stage of evolution.
Zigzagoon --(level20)--> Linoone
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Zigzagoon, Poocheyna, Treeko, Chikorita, Linoone
zigzagoon evolves into linoone at level 20 in Pokemon emerald
No
Sableye does not evolve.
Any water Pokemon besides magikarp and also linoone can learn surf as well.