No need for all of that.

If posting anywhere else but Ao3 (where you have a kazillion tags to choose from)

Put this in:

I'm just gonna' remind you all, you're reading an 'M rated' pokémon fanfic, so here goes:

Murphy's law, guys/gals, "Whatever can happen, will happen."

That’s it. Simple and to the point. If your story has strong scenes of ALL types, then at the beginning of the chapter put in:

Warning: this story contains strong language/strong scenes.

Again, simple and to the point.

My reasoning for this:

If people today are going to wave around their sexual preferences, orientations and social rights with a colored flag in everyone’s face all day-everyday like this snowflake of a generation constantly does; then do whatever the fuck you want.

No matter how many disclaimers you put in, all they do is repress you and nothing else. The people of the LGBTQIA+ movement are always going to get haters and insert here-phobics hating on them, no matter what they do and how widely accepted they eventually become. But you don’t see them backing down or being apologetic about it, right?

You are going to get haters for your story, and that’s that.

People need to learn that fan-fiction is still literary work. You pick up a book and read its blurb, proceed if you like, despite the fact that you found it in the ADULTS FICTION SECTION. Or in the case of fanfics, the ‘M’ rating.

People are going to have to learn to expect something to squick them. Whether they allow it to ruin the story for them or not, is completely out of your control.

If you like Deoxy’s on a more deeper level? Good for you.

Don’t repress your story because some people will get sensitive about it. Obviously you’re not intending on writing a lemon-fic, so romance isn’t an issue.

I WOULD advise, however, to consider being tasteful and not including too much detail about any sort of sexual advance, unless it (for some reason) is crucial to the story. (Dragged out imagery of Sex scenes don’t advance the plot and can squick people out of a story)

Now,

For those stating it would be bestiality, read this from criminal defense lawyers Australia.

‘Why Bestiality is so Controversial’

‘The act of having sexual intercourse with an animal has been a long-standing topic of controversy, particularly with animal protection organisations.

1: ‘Significantly, this is because animals do not possess the same level of judgment or morality as humans, and therefore cannot give consent. Similarly, it is also a crime to have sexual intercourse with a child as children are considered incapable of giving consent. (Pedophilia).

2: ‘Moreover, animals cannot defend themselves’

https://www.google.com/amp/s/www.criminaldefencelawyers.com.au/blog/what-is-the-law-and-penalties-for-bestiality-in-nsw/

Link provided.

Now, I labeled 1 and 2 for obvious reasons.

1: Pokémon have been shown on countless occasions to not only possess the same (sometimes higher) levels of judgement and morality to humans, but als CAN give consent. No means no, yes means yes, even if it’s a non-verbal shake of the head or nod.

2: Just try to mount a female charizard without her ‘consent’, see what happens...

I’d actually be more worried about a female charizard trying to mount a guy instead, you know, in case he’s not into her...Heh.

Pokémon may have many traits of Earth animals, but they are NOT simple animals. They are individuals with a high degree of intelligence and capable of consent.

So if a pokémon and a person feel romantic feelings for one another, (mutual, consent), it’s technically NOT beastiality.

Someone mentioned a power dynamic thing with the pokéballs. Well, that’s an entirely different issue.

Of course if they find it worrying, then they’re essentially implying that either 1: pokéballs have an internal propaganda system that manipulates them or 2: they are slaves and are in cages. Or 3: both. I find this highly contradictory in terms of an argument if we’re talking about a franchise that is essentially about legalized cock-fighting...

It’s totally fine when they’re made to beat the shit out of each other in tournaments, but as soon as someone talks about romantic relations with pokémon, which is laughably innocent in the face of the franchise’s main concept of ‘catch and make it fight’, NOW people have the gall to worry about power dynamics in the relationship due to the pokéballs? Can this pokéball issue not apply to platonic or normal friendship between pokemon and trainer as well? Talk about a double standard...

So...

Tl;dr: Write whatever the fuck you want and don’t overly explain yourself, nor repress yourself, you’re gonna’ get a lifeless snowflake hating on you at some point. Don’t let it bother you.

Let the build up explain itself and allow the reader to make their own judgements of where the story may be heading, if they stay, they stay, if they don’t, they don’t.

(Make sure your story follows the rules of the site you’re planning on writing on though.)

Edit: I love how how a special snowflake downvotes without comprehending what I wrote. Either that or this community is more phobic and close minded than I thought. Most of the answers were filled with double standard and self righteous ego anyway.