If we're to implement a "speed limit," I think 65 is actually a good number to look at. The reason is that having exactly 65 Base Speed locks off CAP26 from having any chance to outspeed Heatran. Outspeeding Heatran would be beneficial for CAP26, but CAP26 will always want to outspeed Heatran. The problem with that is that CAP26 will need to flex its defenses really well, and dumping all of its EVs into Speed cuts into CAP26's bulk. For reference, Modest Heatran is has an actual speed stat of 253. If CAP26 can hit that stat, it will want to. Thus, I'd argue we want to avoid any Speed stat that's 66 or greater so CAP26 doesn't feel compelled to run all those Speed EVs and a Timid Nature - the problem gets worse as you approach 66 from above (e.g., 66 would be the worst speed stat because CAP26 would actually run max speed EVs with a Timid nature).



Another number we have to keep in mind is 95. That's Tapu Lele's speed tier. We cannot outspeed, or speed tie with, Tapu Lele, or else CAP26 will definitely want to run a more reliable Steel-type STAB. Thus, I'd place another, more definite "speed limit" at 94. Outspeeding Heatran is a lot easier at this speed tier, but we're approaching relatively fast spreads that might not have the BSR to able to account for the bulk we want for CAP26 to tackle Pokemon like Choice Specs Tapu Lele and Mega Alakazam.



So I think the speed tiers we need to look at are from 1 to 65 or closer to 94, though I think 65 is the most optimal choice. Even if we're forced out by Heatran, Heatran doesn't want to switch into Earth Power, and of course setting Doom Desire on the Heatran switch-in doesn't forfeit so much momentum.