In the teaching practicum programs, stimulating ESL/EFL preservice teachers' (PSTs) pedagogical competence is essential in the transformative learning (TL) framework. This paper discusses stimulating PSTs' pedagogical competence (PC) for TL through critical reflection on ELT practicum. Critical reflection on the teaching practicum experiences can stimulate PSTs in enhancing PC for their professional development in preparing for future teaching careers. Through critical reflection on the teaching practicum experiences, PSTs learn from the reflective practices to stimulate their PC, which is very influential in undergoing the teaching and learning process to achieve successful learning and improve students' learning achievement. In the process of critical reflection, PSTs' PC can be reflections toward better practices as the PC taxonomy shows its role in developing PSTs' PC. A design of intervention for the change of PSTs' beliefs of teaching and learning during the teaching practicum leads them to transform PC into practices. Critical reflection value becomes essential for teacher educators, and it would emphasize teacher education programs. It positively contributes to training and creating PSTs' habits of mind for continuous growth, and they would develop and advance in carrying out their teaching profession. Thus, critical reflection on the teaching practicum of the English education programs in the Indonesian EFL context becomes a stimulus for PSTs' professional development, particularly in stimulating PC for TL to frame their identity as professional teachers.