Although the NASP 2020 Standards emphasize consultation as a core competency, few studies have examined consultation preservice training on consultant outcomes. This article describes the content and implementation of a training program focused on ecological-positive behavior consultation, called "Positive Environment and Behavior for Building Learning and Engagement" (PEBBLE). PEBBLE incorporates (a) didactic instruction related to consultation and ecological-positive support strategies, (b) evidence-based strategy and consultation implementation resources, and (c) supervised in-vivo practice. Outcome measures assessed both trainee outcomes, including self-reported efficacy, knowledge, and confidence, and classroom outcomes (direct observations). Results show PEBBLE led to statistically significant improvements in trainees' self-reported efficacy, knowledge, and confidence and had a positive impact on classroom environments. Additionally, students who participated in PEBBLE in their first year of school psychology training had self-efficacy and competency ratings comparable to more advanced students. Implications for consultative training based on ecological-positive support approaches and future research are addressed.