Out of all the Digimon of the First season Patamon was the last to Digivolve. This is because he wasn't sure about what would happen when he did. Only after he learned that he needed to in order to protect others was he willing to do it, and that willingness to serve is what gave him the strength to Digivolve.
Later on he learns an extra Digi-evolution and Digivolves into MagnaAngemon. This would be impossible without going through some kind of test to make him stronger.
Just as steel is stronger when it is forged and put through the fire, so to must we each pass through a Spiritual Fire and grow from our trials. (Numbers 31:23)
By learning from our trials we will be strengthened and increase our capacity to endure, and 'Digivolve' ourselves into a greater ability of obedience to the Commandments of the Gospel.