I don't know what Intercept Bit or Dark Corrosion do, but so far, it looks like a bog-standard wall to me, which isn't necessarily bad if that's what you're looking for. Defense Doremy may seem like a Focus Wall due to her high base HP and Focus Defense stats, but her Spread Defense isn't bad either, so she can also make for a pretty good Mixed Wall.
However, without any ability to increase her defenses (which I'm uncertain if this set can do so), or to otherwise ignore or negate stat boosts from the opponent, this set seems vulnerable to stat-boosting wallbreakers and sweepers like Power Elly or Assist Chen.
