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The problem is NP-complete. We'll make a series of reductions from max-cut to show this. Problem 0 (your problem): Given a graph $G$, does G have an induced subgraph with at least k vertices, such that all vertices have even degree within the subgraph? Problem 1: Given a graph $G$ and subset $A$ of vertices, does $G$ have an induced subgraph with at least $...


One example: choosing the property "G contains a node that has an edge to all nodes in G" makes P1 trivial in $O(n + m)$ (pick node with largest degree), but makes P2 the problem of finding the minimum size dominating set, which is NP-hard.

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