The creature tower over you, standing at a height of 2'7", though for you, that may as well be a few hundred meters. Blue dominates its color scheme, with the exception of a few darker spot here and the cream underbelly. Its clawed foot comes crashing down next to you, emitting a quake that sends you onto your back. Looking up, you see it looking down on you, its deep red eyes meeting your own, its huge ears twitching in the afternoon breeze, seeming to focus in on you. You stare at each other for a few minutes, before finally, you hear its soft, feminine voice say, "Are you... a tiny human?"
You deduce that you've been discovered by a Nidorina. You nod nervously as she picks you up in her gigantic paws, examining you closely. "What on earth happened to you, little guy?"
Upon hearing the concern in her voice, you slowly start to calm down. "I don't know," you squeak. "I felt dizzy all of a sudden and passed out, and when I woke up, bam, I was shrunk." You look around every which way in hopes of finding anything that could possibly relate to how you got like this, but all you see is your bag on the ground and the giant Pokemon who found you.
"It isn't safe out here, there are a lot of hostile Pokemon roaming around here this time of year who would love to have something like you as a snack. You're lucky I found you first. A Zangoose or something would have been a nasty surprise."
"I guess you're right," you say. "What am I going to do now?"
Nidorina rubs the little nub where her horn would be, thinking deeply about the situation, soon arriving at a possible, if not interesting solution. "I have an idea, but..."
Your ears perk up upon hearing those words. Did she think of a way to get you back to normal? Or at the very least, keep you safe until you find a way? Your hopes skyrocket as you eagerly ask, "What is it, what is it!?"
"Well, it's a really weird idea. You sure you want to hear it?" You say yes, thinking nothing could be weirder than what's already happened today. "Well... I was thinking... maybe you could... live inside of me?"
You are taken aback in surprise. Not only was this giant Pokemon friendly, but it was offering to help you after being shrunk for unknown reason. But nothing could prepared you for her ridiculous suggestion. "You're suggesting I live... in your body?" Her beautiful blue face slowly turned a bright red as you repeated her words. "But won't your stomach acids digest me?"
"Oh, no," she reassured. "I'm an herbivore, my body is designed to digest plants and berries. My acids aren't strong enough to hurt you in any way."
You ponder the situation for several minutes while Nidorina continues to stare at your tiny body, patiently awaiting your answer. On the one hand, she's right. You're in a dangerous situation with all the wild Pokemon running around, and there is no guarantee the next one you meet will be as friendly as this one. On the other, living in a Pokemon's body? That's the weirdest thing you've ever heard! But... she is the one who offere, and it's not like you have any better options at this point... What the hey, you have nothing to lose, you decide to go for it.
"Alright, I'll do it." You could almost see the joy in Nidorina's deep red eyes, making you feel good in thinking you made the right choice. "So, do I just let you swallow me?"
Thinking for a brief moment, she answers, "Well, there is that, but..."
"But...?"
"I guess you could also enter through my butt or... my... you know..." she says while looking down at her crotch. You both blush in embarrassment at the idea.
After some careful consideration, you look up at the poison giantess and say, "Okay, I'll enter through your..."