(OOC: Oops, I thought they both evolved at level 16. Turns out Totodile evolves two levels later. Sorry! With that said...)
As they were talking, Timothy was idly holding the Thunderstone when he got an idea. He looked around, and sure enough, one of the wild Eevees was close by. He hadn't seen any Electric Pokemon yet, but he knew one way to get a good one...
"Hang on," he said. "I'll be right back."
He went up to the Eevee and sent Squirtle out against it. Seeing the threat, Eevee launched itself at Squirtle with its Take Down attack. Squirtle turned the back of his shell to Eevee, who hurt itself against it.
"One Water Gun ought to do it now," Timothy said.
Squirtle launched a jet of water at Eevee, and Timothy threw a Poke Ball at the soaked Pokemon. His attempt succeeded, and Eevee was captured.
What happened next was even better. Squirtle started glowing a bright bluish-white and grew larger. He sprouted fin-like ears and his tail got bigger as well. When the process was complete, Timothy had a newly-evolved Wartortle.
"Good job!" Timothy said. "Congratulations on evolving!" He returned Wartortle to his Poke Ball.
"Wow, your Squirtle evolved too?" Harry observed. "But why were you trying to capture an Eevee?"
"Remember the Thunderstone my parents gave me?" Timothy asked. "I think it's time to put it to good use."
He released Eevee, who was still a little hurt from the fight. Giving it a Sitrus Berry seemed to help, and Eevee started bouncing around hyperactively. Timothy held out the stone, and Eevee, seeing it, walked up and took it from him. There was another flash of light, and Eevee evolved into Jolteon, its electric form.
(OOC: Gotta go now, I'll be back later tonight. EDIT: The stone is still there, it just can't be used to evolve a Pokemon anymore.)
Building the shelter was actually easier than Timothy thought. Onix smashed down trees easily, and Ralts managed to help put the logs into position to build a makeshift cabin.
All went well until it turned out one of the trees had been a home for a swarm of Scythers...
(OOC: Capturing one is fine; just wanted to add an extra challenge there.)