On our way to Oreburgh City where Ash and Volo's first Gym Battle take place, we see Volo training his newly caught Petilil as it battles a Pokémon inside a nearby cave as Ash the others were somewhere in the wood sleeping.
The Pokémon is a short, bipedal, humanoid Pokémon with a pale-yellow body. Its three-fingered hands and two-toed feet are black. It has red eyes and a pair of long, black, ear-like extensions on either side of its head. Its legs resemble a hakama. Its most notable feature is a pair of large black jaws emerging from the back of its head. These jaws have a yellow, oval-shaped spot on their top surface. They contain ten sharp, metallic teeth - six on the top row and four on the bottom. While the jaws are actually transformed steel horns, it can articulate them at will, using them to bite enemies with enough force to break an iron beam. These jaws are incapable of tasting, leading it to use them to eat food it does not like.
"Okay, Petilil, Sunny day!" Volo commands
Petilil causes a bright and warm light to appear in the sky.
"Wile!" The Pokémon charges at the Pokémon attending to use Bite.
"Dodge it!" Volo commands as Petilil dodges at ease thanks to it's ability Chlorophyl "Now, Leech seed!" Petilil launches its Leech seed at the Pokémon who gets drained by the leech seed.
"Alright, Pokéball here we go!" He throws the Pokéball to the Pokémon who gets sucked inside the Pokéball once it made contact with the Pokémon.
The Pokéball wiggles but opens releasing the Pokémon much to Volo's annoyance; the Pokémon then begins to spin rapidly, creating strong gusts of sparkling wind to blinds Volo and Petilil only for it to escape.
Volo sighs with disappointment "well, no one said catching Pokémon will be easy" Volo comment.
"Lil..." Petilil looks down feeling sad that it didn't beat the Pokémon.
Volo picks Petilil up "Hey don't feel down Petilil, there's always a next time, don't worry too much" he assures the Bud Pokémon.
"Petilil!" Petilil cries happily.
Volo smiles at the Grass-type before noticing something flashing through the wall, he takes a closer look and sees a Stone that has a shape of a sun which Volo immediately recognizes it as the Sun Stone.
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"Is a Sun Stone" Volo stated with a big smile on his face "with this You can Evolve into a Lilligant!" Petilil looks confused as Volo kneels to put Petilil down "And Normally I would just make them evolve, but I want you to be the one to make the decision Petilil, do you want to evolve now, or later?" he asks.
"Lil?" Petilil looks at the stone before shaking its head meaning it's not ready yet which Volo nods.
"Alright, so let's take it as a souvenir, then" Volo suggests which the Bud Pokémon nods.
