The Viego build for Jungle is Trinity Force and Conqueror. This LoL Viego guide for Jungle at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Viego Counters
50.4%
(+0.6%)
55.4%
(+0.3%)
7.3%
1.9%
(-0.0%)
625
(-7)