BUG REPORT
Okay Snaquaza, bug in Nature Swap, on aqua, here's the replay: http://replay.pokemonshowdown.com/aqua-natureswap-889
Round 8 or 9, octillery should be at 105 timid base speed with scarf, making it's speed go up to around 500 give or take.
Still metagross at 150 base got to attack first