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Let $M_k^\sharp(N)$ be the space of weight $k$, level $N$ weakly holomorphicmodular forms with poles only at the cusp at $\infty$. We explicitly constructa canonical basis for $M_k^\sharp(N)$ for $N\in\{8,9,16,25\}$, and show thatmany of the Fourier coefficients of the basis elements in $M_0^\sharp(N)$ aredivisible by high powers of the prime dividing the level $N$. Additionally, weshow that these basis elements satisfy a Zagier duality property, and extendGriffin's results on congruences in level 1 to levels 2, 3, 4, 5, 7, 8, 9, 16,and 25.

Weakly holomorphic modular forms in prime power levels of genus zero