Well she's going to use Future Strike once every ten seconds (starting ten seconds after the beginning of the fight), but the first thing she will start off with is her stat boosts. While there aren't any exact numbers or multipliers on how high they enhance, there are feats to show how high they get.
AP boost: She was able to take down Ashley whose durability is comparable to her ap (without the stat boosts) in three hits one time. She's been able to use this combined with her enhanced speed (which she uses for defence) to even take down beings more powerful than her just like Pikachu.
So she can take down stronger foes with her enhanced speed... but this is Speed Equalized.
Although, speed increases that occur within the match will still apply (Ex: If a Pokemon uses Agility or an RPG character boosts their speed with a Haste spell or a Super Saiyan form boosts Speed, that speed boost applies, if it occurred within, not before the match.) so she MIGHT be able to make use of this?
Speed boost: Sparkie managed to dodge an energy explosion at less than a meter away from point blank which Ashley whose speed is comparable to Sparkie's (without the stat boosts) failed to react to in time. She also manages to land a hit on her opponents normally 5-7 times before those as fast as Sparkie (again without the stat boosts) before they do as well. She even managed to do so against someone who also had durability a bit lower than their ap which was high enough to one shot her, but it was only around 20 seconds before Sparkie got one-shot, oof.
You said:
"She also manages to land a hit on her opponents normally 5-7 times before those as fast as Sparkie (again without the stat boosts) before they do as well."
So if I'm interpreting this right, it's meant to mean she can consistently hit opponents as fast as herself, multiple times, before they manage to hit her once? This sounds like a matter of skill.
Precognition should come in handy too and let's not forget the very limited Animsapian death hax.
Even though Sparkie can use speed as her defence, she won't become fast enough to the point where those comparable to her speed (once again before the stat boosts) will be completely unable to even land a single hit on her whatsoever. So yeah the fact that Sparkie's durability is lower and the stat boosts don't even enhance them is still a pain in the butt for her, especially since Pikachu has Agility.
Speaking of Agility, I know it enhances speed by 2x when you use it once and even 4x after using it three times in the games, but do we agree with using that multiplier in debates here or do we consider that unreliable and only game mechanics?
So, those comparable to pre-stat-boosted Sparkie should still be somewhat able to hit stat-boosted Sparkie?
Also, are you saying Sparkie has durability lower than her AP, & her boosts don't affect her Durability?
As far as I know, when it comes to Pokemon moves, we use the in-game values. Primarily because we still consider it canon & valid that the moves are Statistics Amplification, but we have no other metric of how much the moves affect the Statistics by.
The games are just as canon as the other entries in Pokemon, & the alternative is going: "Hey, how much does Agility boost by?" "I dunno." "Should we use stat stages?" "No, that's game mechanics!" "Great, so back to square one."
Whether you consider it gameplay or not, the games are still a valid part of the canon, & when we have evident multipliers from such a source, it's better to use them than not, so we at least have SOME kind of answer for the question in these threads.