That episode has one of the most egregious examples of Ash failing to catch a Pokemon I've ever seen.
The Snover was practically asking to go with him. Ash never even considered getting out a Pokeball.
(It's not like it hangs out with a Bagon or Gligar.)
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You should get at least one alt in the event you get warned or put into Purgatory. - Luster
It's probably easier to just not break the rules. - SmartMuffin