It'll manage to take a hit or 2 from a Togekiss. Also Mega Gallade also gets Ice Punch for type coverage.
It is already stacked well with its STAB attacks and Knock off, aside that Togekiss would rather opt to paralyze then proceed to attempt flinching (either way its not an ideal match up). The ability is lack luster, least more on singles, since flinching isn't all that common especially with the drop of popularity in Togekiss and Jirachi, who now find themselves in UU, that the ability is largely unused for most part. That aside it has already been discussed to death, it is just lack luster, so no dwelling on it further since it was at least blessed with more reliable stats, which is the entire issue with inner focus reliability (again flinching is far too rare or negligible at this point).