I don't feel that Bold natured Suicune is the hands down best nature to run. In my opinion both Bold & Modest nature are viable. In the beginning of January I used a Modest Suicune to win Justin's 64 player tournament [At the time Suicune was uncommon] My team at the time was having problems VS Heatran. In order to improve my teams matchup I ran a Suicune with enough Speed EV's to out speed Heatran and enough SPA EV's to always 2HKO it. Aaron's recent regional team with Suicune had very little problems with Heatran, making Bold the more beneficial nature for his team. There is no cookie cutter build for a Pokemon like Suicune. You should always personalize Natures and EV's according to your team needs, not to what everyone else is using.
Edit: The Modest Suicune still lives Mega Kang's Adamant Double Edge.
Edit: The Modest Suicune still lives Mega Kang's Adamant Double Edge.
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