Yes, the TM Sunny Day is in Pokemon Emerald. You can find it in a cave in the middle of the lake in Route 120 called Scorched Slab.
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You can obtain the TM Sunny Day from the Radio Tower located in Goldenrod City.
NOWHERE.The TM trick is not available as a TM in Pokemon Emerald
use a TM
in the safari zone
Tm. 35