Elastic Metamaterials are artificially engineered periodic structures which exhibit non-intuitive properties that can control the wave propagation and have recently gained much interest in the non-destructive evaluation (NDE) community. Nonlinear ultrasonic guided waves are some of the most exciting new tools to achieve remote detection of early-stage damage, owing to their high-sensitivity and long-range propagation features. However, nonlinearity from instrumentation, transducer, and couplant creates false positives apart from material-based or micro-crack based nonlinearity, which leads to inaccurate measurements. Here we experimentally demonstrate a novel technique of using a waveguide metamaterial rod, which acts as a mechanical filter for suppression of unwanted higher harmonics components in the measured signal. This research work also demonstrates focusing of ultrasonic guided in cylindrical rod like structures. The novel technique developed in this research work finds wide application in achieving extraordinary properties, including guiding, focusing, mode filtering, and trapping of ultrasonic wave modes in such geometries, which are increasingly essential to improved inspection and characterization of materials in engineering and biomedicine.