Final answer:
The 11-letter word is "dribbling," which is necessary in soccer and hockey but can result in penalties in basketball if rules are broken during dribbling.
Step-by-step explanation:
The 11-letter word ending in "-ing" that is a necessary skill in soccer and hockey but is considered a penalty in basketball is dribbling. In soccer and hockey, dribbling is a fundamental skill where players control and move the ball or puck while preventing opponents from intercepting it. However, in basketball, dribbling is permissible, but specific infringements during dribbling such as double-dribbling or traveling result in penalties. When adding the suffix "-ing" to a base word to form a gerund such as dribbling, sometimes a consonant is doubled, as mentioned in the reference to the addition of "-ing" to 'hop' becoming 'hopping'.