Does Defensive Ball Curl activate Rylai?
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It does since W does damage
http://leagueoflegends.wikia.com/wiki/Rammus
Defensive Ball Curl is a self-targeted buff. Applies spell effects as an area of effect ability. Spell vamp is reduced to one-third effectiveness. Rylai's Crystal Scepter will apply a 20% Slow icon slow for 1 second. Magic damage will be mitigated by magic shields. Banshee's Veil Spell shields will not block the damage.
Yes it does.
Spells that deal damage will apply Rylai's. This includes abilities that scale on AD.
Spells that modify auto-attacks will not apply Rylai's unless it specifically states otherwise.
Check the wiki maybe. Would save you having to talk to us gameplay people