Does a creature with a tiny size, and a reach of 5, sharing the space of the enemy provide flanking? Example down below. X being the enemy, T is the tiny creature and Me is well, me.
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Core Rulebook page 197 wrote:
When making a melee attack, you get a +2 flanking bonus if your opponent is threatened by another enemy character or creature on its opposite border or opposite corner.
When in doubt about whether two characters flank an opponent in the middle, trace an imaginary line between the two attackers’ centers. If the line passes through opposite borders of the opponent’s space (including corners of those borders), then the opponent is flanked.
Exception: If a flanker takes up more than 1 square, it gets the flanking bonus if any square it occupies counts for flanking. Only a creature or character that threatens the defender can help an attacker get a flanking bonus.
Creatures with a reach of 0 feet can’t flank an opponent.
In your example, the question becomes: Is the tiny ally's position on an opposite border of the opponent's space from the space you occupy?
Since each ally is roughly positioned within 90 degrees of separation from the enemy's perspective (instead of the approximate 180 degrees required), it's not difficult enough for the enemy to keep tabs on their positions to warrant the normal flanking bonus.