I disagree.
Seedtooth has evolved into an arkadion that has helped me VERY far into the game. I have used it with Skullwraith so long they might as well be best buddies now - and don’t tell me you just mean seedtooth and not its evolutions, because let’s face it, a lot of arkadions with evolutions aren’t very good at first. LOL. Just look at the hatchlings. 
Toucan: I disagree. Have you taken a look at that last move? It’s its only offensive move - but holy mackerel, it’s powerful for a 6*. It’s almost one shotting everything, and in boss fights, it does more damage than my starter which is 1) the same element 2) two levels higher 3) the same rank 4) a higher grade and 5) has more base magical power than Toucan (Ally Wind is magical).
HOWEVER, I must add something: I have seven other air arkadions in my team… so that’s maybe why it seems so powerful to me. But even then, I think this is enough to remove it from your top 3 worst arkadions. It’s not the worst. I agree with Deadpool, Gustbat/Galebat sucks. 
Suggestions for top, in no order:
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Voltiger. Man, I regret to overlook this one when I first completed the story. It’s very good.
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Bouldon. My favorite “common.” I still have one in my team, actually, and it’s a great detonator and packs a good punch.
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Pengboss. Very good starter tank and definitely easier to get than Stegodon, Metallodious, or Barricadus.
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Solama. Terribly good attack, for its rank!
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Chopperbug. Now, hear me out. Jemni helped me with this one, and though it’s only a 4* (that’s right, folks) it has KILLER moves. Time Strike, Bolster, Stun Skin? OH YEAH. This little bugger (no pun intended, I swear) deserves a big hug.
Suggestions for the worst, in no order:
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Mantisword. Really? Really? Now, I may be misjudging this guy, but as far as I know Mantisword summons no good arkadions, dies after it summons, and is generally not a good attacker. Firequeen doesn’t summon strong arkadions easier but at least she has a chance to live!
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Firesoldier. Sorry, but… no. I beat that quest full of firesoldiers very easily, as in, under a few minutes. It wasn’t hard at all. The only thing I see a use for here is Firequeen.
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Bitefish/Biteschool. Is it just me, or are these guys just really weak? They do almost nothing to my team.
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Aerodactyl. Same as Biteschool, where is their power? They sort of tarnish the dragon name, here.
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Blazewing. See above.
Thoughts? Just because I listed something doesn’t mean I’m totally sticking with it. I want to hear suggestions!
Good thread, Sly.