Is there a reason for Durant having Truant?

Question

As said on http://pokemondb.net/pokedex/durant

Answer 1

Nope, no reason at all! Just Game Freak crapping on another Bug-type who has potential (i.e. Bug/Flying spam, Masquerain's weak stats, constant x4 weaknesses).

I think they just thought of giving Truant as a dream world ability was to be a little joke. It's no big deal though, since Aianto's other abilities are pretty fair!

Comments

The biggest disappointment was Make Friends doesn't work with Truant.

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Th biggest disappointment was the inclusion of Truant in the first place.

Answer 2

The reason for it having Truant is because, although it can not be removed by Entrainment you can give the opponent Truant with it. Here is a good set for it.

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Item: Focus-sash
Nature: Jolly
Ability: Truant
EVs: 252 Speed, 252 Attack, 6 Hp

Entrainment
Iron-head
X-scissor
Stone-edge/Thunder-wave

Entrainment DOES work with Truant and is the devastating part of this set. Iron-head is for STAB, and Flinch. X-scissor is STAB. Stone-edge is coverage and T-wave is for if you really want to be annoying.

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But beware this is so annoying that people may get angry if you use this on them.

Comments

You can only have 4 HP EVs I'm afraid. Nice set though, I'd use it if I had the time to IV breed and stuff

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What's the purpose of having Entrainment on a Durant with Truant. Entrainment doesn't work when the Entrainment user has the ability Truant?

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Yes it does. Entrainment only fails if the target's ability is Truant. If the user has Truant it's fair game. I have played against this strategy many times before -- it's usually paired with something like Arena Trap Dugtrio that can set up on each turn the enemy does nothing.
Sorry if this is picky @extremeevoboost but 6 HP EVs are technically possible since two sets of 252 only use 504/510 EVs. But the two extra points do nothing, at least as level 100.