Technically, you should be able to pull off most of trials moves on almost any hardtail mountain bike. Those moves will never be as easy and long-ranged as they might be on a trials-specific bike, but you should be able to do it. This means that usually, with some slight modifications, your hardtail WILL be sufficient for first few months of your trials career and WILL NOT hold you back to extent where it would be justified to spend a huge amount of money for a new bike.
You will have a harder time learning some of the moves though. This, however, is a very generalized answer and is valid only for the first few months of trialsing, depending on your own speed of learning. Usually, people want to know if their cross-country (XC) or freeride/dirt/dual (FR) bikes will suffice for a bit of playriding in trials.
Let's deal with both kinds separately. XC Cross-country geometries can vary greatly. If you have oldschool XC geometry, it will mean almost straight top tube, meaning very, very ... more.
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