R.O.B Sentry is a member of the R.O.B. Squad and enemy of The Subspace Emissary. It looks like R.O.B. since it has his normal color. When it spots you it follows you and attacks with one arm. It hits you with that arm. This attack has high knockback on intense. R.O.B. Sentries are the weakest (have the lowest health) however, not all trophy stands directly turn them into a trophy. Just in case it doesn't work if you get a trophy stand near R.O.B. Sentry, ignore it, and hit the R.O.B. Sentry. Run away with the trophy stand an throw it at the R.O.B. Sentry.