Isn't that part of the Evasion Clause only relevant to regular Singles? The only reason it's allowed there is because mons can easily be forced out, removing their only way to boost their evasion. In 1v1, however, there is no switching, so it's impossible for the opponent to remove your evasion boosts unless they are Unaware or have Haze.A lot of people seem to be arguing that Z-Detect breaks the evasion clause, but I disagree. The second part of the evasion clause is important:
Z-Detect is a one-time use move that is directly linked to an item. Without said item Detect by itself does not increase evasion. Therefore I would argue that the evasion boost is derived from an item, and should not simply be swept under the rug as "against the evasion clause".
Z-Detect is a niche evasion boosting move that is essentially an extra-powerful BrightPowder that also (kinda) costs you one of your move slots as well as your item. It's not any more or less competitive than sleep, moves that can flinch/status, moves that can miss, etc.