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Spore will be one of the most important moves Smeargle learns. Try to raise a Breloom or Parasect with Spore, then trade it to another game, make a secret base there, mix records, and now you can fight your own Pokemon and give Smeargle a bunch of good moves to learn.
You should aim for a Smeargle with the following moves below so your final Smeargle should be:
Smeargle @Salac Berry
Spore
Substitute
Belly Drum
Baton Pass
This Smeargle's job is to support its teammates. Put slower opponents to sleep, then Substitute and finally Belly Drum. MAKE SURE your HP is divisible by 4 so that Salac Berry activates when you're at 25% health. After that you can passing +6 attack and +1 Speed to another physical attacker and let them sweep!
or
Smeargle
Spore
Endure
Endeavor
Quick Attack/Seismic Toss
This Smeargle can attack by itself. If you know your opponent will kill you in one hit, use Endure. Then you'll be faster due to Salac Berry and you can put them to sleep, then Endeavor them to 1 HP, and finally Quick Attack or Seismic Toss to finish them off.
The problem is that Salac Berry can't be obtained if you don't have access to Mirage Island.
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