Yes, EVIDENCES is a Scrabble word!

Letter values in Scrabble US: E 1, V 4, I 1, D 2, E 1, N 1, C 3, E 1, S 1.

Is it a valid word?

EVIDENCES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

your basis for belief or disbelief; knowledge on which to base belief
an indication that makes something evident
(law) all the means by which any alleged matter of fact whose truth is investigated at judicial trial is established or disproved

provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes
provide evidence for
give evidence

Also: bear witness.