Doesn't Availability refer to when in-game you catch it, not how hard it is to catch? Also, isn't it around a 1/7 chance of 1%!Bagon summoning Salamence?
Salamence (caught as is lol)
Availability: BAAAAAAD. Like, absolute bottom-tier, as bad as it can possibly get.
As good as everything else is about Mence this is obviously the biggest kicker against it. 1% chance to encounter Bagon on Route 3, then 1% again for Mence to show up as reinforcements. If you do this early, you NEED to stock up on resources (and I don't think PP-recovery can even be bought at this point or maybe ever, which is a BIG timer on your ability to keep SOS-chaning bagons), and if you do it later, it surprisingly takes some babying to get up to speed (thankfully Mence's slow exp gain isn't too noticeable this early). If you can conquer the odds, though it's all downhill from there.
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I don't think we should tier Pokemon factoring in their encounter rate, because it's entirely possible to get a Salamence as it's first summon, no Adrenaline Orb even required. It should be mentioned in the Additional Notes or something how difficult something may be to encounter, but I don't think this should lower it on the tier list, Because then it's not in a spot that accurately reflects how it does in game.