Welcome to the Elite Four Guide. Here, you'll be able to get help with Elite Four Aaron!

Elite Four Aaron
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Most effective Pokemon: I am training a Rapidash to take him on.
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OK. First up is Aaron. Don't worry, he doesn't have Groudon anymore.
But he is still strong in battle. If you have chosen Piplup as your
starter and he/she has evolved into Empoleon, Aaron can be deadly!
Here is the order of his Pokemon team:
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Dustox! 
LVL 53
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Dustox is a very evasive Pokemon with good speed. If you are around level 60,Dustox
shouldn't be hard to defeat.
If you use a level 68 or above, it is a positive one hit!
Dustox is a BUG/POISON type Pokemon.
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Heracross
LVL 54
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Heracross knows Close Combat, so if you use an Empoleon, it will be hard.
It is a strong BUG/FIGHTING type Pokemon and it can be very useful in your team. 
Its Attack Stats and HP are very high, so I understand why Aaron uses it.
Apparently, it knows the move Stone Edge, a move you should look out for.
If you have a pokemon who knows this move or can learn it, then by all means train it and
send it in!
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Vespiquen
LVL 54
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Like Heracross, Vespiquen is an EXTREMELY useful Pokemon. You should get one and train it
hard! Its Defense Rate is nearly off the charts!! Luckily, it is only level 54. Hopefully
you have a Pokemon above level 59. Vespiquens high defense also means that it is built
like a tank! So use some Fire Type moves to take it down. It is a BUG/FLYING Type.
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Beutifly
LVL 53
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This is Aaron's weakest Pokemon, so there is no need to worry. Don't waste your stronger
moves on it.
Beutifly is also a BUG/FLYING Type.
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Drapion
LVL 57
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This is Aaron's strongest Pokemon! It is a POISON/DARK Type and knows Aireal Ace witch is
very fast. If you want a Drapion, then look for a Skorupi in the Great Marsh and evolve
it. Good luck!