the ways iirc arent different, it's usually just the strongest/most relevant trainer in town, either according to the league or by referral
anyways, question: is/was crescent aligned with indriad? if we assume that indriad was the one with the yveltal who set keta's house on fire (wll), and crescent the one who set on fire wispy tower, wouldn't it make sense? although there is one weird detail which should be pointed out: indriad was apparently able to spy on team xen (an organisation which for most of its existence has been underground) but couldn't use it to figure out who vivian's reincarnation was and that nora wasn't at the radio tower?
this is probably stupid though, especially since the red haired time traveler says the other person hunting down keta (or rather taelia/aelita) was a he, and the only person who's a he and has/is linked to yveltal is indriad.
also, almost all actions she's taken against xen also indirectly benefit indriad (with madame x being opposed to him and all that), but it's probably not too relevant
that also begs the questions:
- is she still aligned with indriad?
- if yes, why does she help the player?
- part 2: is indriad then far more connected to the player?
- if she isn't still aligned with indriad, why?
finally,
putting this here to not necropost, but there's another piece of information which could actually prove this, specifically melanie killing the "children of nymiera". that would imply that either melanie or the person behind her (indriad?) would bear hate towards nymiera (otherwise why specifically name nymiera?), given that most people in alternate future either don't know about her or respect her